October 1 update. Our PDGM and ICD-10 tools now use the FY2027 code set: 190 codes added, 30 deleted, and no existing code changed clinical group.

See what changed

ICD-10 · PDGM grouping

T41 Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases

All 126 codes in the T41 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.

ICD-10-CM FY2027 · CMS grouper v07.2.26

Codes in family

126

Can lead a claim

84

Cannot lead a claim

42

What CMS assigns to T41

84 of the 126 codes group to MMTA - Other; 42 are assigned no clinical group. None of the 126 is assigned a comorbidity subgroup. 84 of the 126 can lead a claim.

Every code in T41

Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
T41.0 Poisoning by, adverse effect of and underdosing of inhaled anesthetics
T41.0X Poisoning by, adverse effect of and underdosing of inhaled anesthetics
T41.0X1 Poisoning by inhaled anesthetics, accidental (unintentional)
T41.0X1APoisoning by inhaled anesthetics, accidental (unintentional), initial encounterCMS: Poisoning by inhaled anesthetics, accidental, initCan lead a claimANone
T41.0X1DPoisoning by inhaled anesthetics, accidental (unintentional), subsequent encounterCMS: Poisoning by inhaled anesthetics, accidental, subsCan lead a claimANone
T41.0X1SPoisoning by inhaled anesthetics, accidental (unintentional), sequelaCMS: Poisoning by inhaled anesthetics, accidental, sequelaCan lead a claimANone
T41.0X2 Poisoning by inhaled anesthetics, intentional self-harm
T41.0X2APoisoning by inhaled anesthetics, intentional self-harm, initial encounterCMS: Poisoning by inhaled anesthetics, self-harm, initCan lead a claimANone
T41.0X2DPoisoning by inhaled anesthetics, intentional self-harm, subsequent encounterCMS: Poisoning by inhaled anesthetics, self-harm, subsCan lead a claimANone
T41.0X2SPoisoning by inhaled anesthetics, intentional self-harm, sequelaCMS: Poisoning by inhaled anesthetics, self-harm, sequelaCan lead a claimANone
T41.0X3 Poisoning by inhaled anesthetics, assault
T41.0X3APoisoning by inhaled anesthetics, assault, initial encounterCan lead a claimANone
T41.0X3DPoisoning by inhaled anesthetics, assault, subsequent encounterCMS: Poisoning by inhaled anesthetics, assault, subs encntrCan lead a claimANone
T41.0X3SPoisoning by inhaled anesthetics, assault, sequelaCan lead a claimANone
T41.0X4 Poisoning by inhaled anesthetics, undetermined
T41.0X4APoisoning by inhaled anesthetics, undetermined, initial encounterCMS: Poisoning by inhaled anesthetics, undetermined, init encntrCan lead a claimANone
T41.0X4DPoisoning by inhaled anesthetics, undetermined, subsequent encounterCMS: Poisoning by inhaled anesthetics, undetermined, subs encntrCan lead a claimANone
T41.0X4SPoisoning by inhaled anesthetics, undetermined, sequelaCan lead a claimANone
T41.0X5 Adverse effect of inhaled anesthetics
T41.0X5AAdverse effect of inhaled anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.0X5DAdverse effect of inhaled anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.0X5SAdverse effect of inhaled anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.0X6 Underdosing of inhaled anesthetics
T41.0X6AUnderdosing of inhaled anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.0X6DUnderdosing of inhaled anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.0X6SUnderdosing of inhaled anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1 Poisoning by, adverse effect of and underdosing of intravenous anesthetics
T41.1X Poisoning by, adverse effect of and underdosing of intravenous anesthetics
T41.1X1 Poisoning by intravenous anesthetics, accidental (unintentional)
T41.1X1APoisoning by intravenous anesthetics, accidental (unintentional), initial encounterCMS: Poisoning by intravenous anesthetics, accidental, initCan lead a claimANone
T41.1X1DPoisoning by intravenous anesthetics, accidental (unintentional), subsequent encounterCMS: Poisoning by intravenous anesthetics, accidental, subsCan lead a claimANone
T41.1X1SPoisoning by intravenous anesthetics, accidental (unintentional), sequelaCMS: Poisoning by intravenous anesthetics, accidental, sequelaCan lead a claimANone
T41.1X2 Poisoning by intravenous anesthetics, intentional self-harm
T41.1X2APoisoning by intravenous anesthetics, intentional self-harm, initial encounterCMS: Poisoning by intravenous anesthetics, self-harm, initCan lead a claimANone
T41.1X2DPoisoning by intravenous anesthetics, intentional self-harm, subsequent encounterCMS: Poisoning by intravenous anesthetics, self-harm, subsCan lead a claimANone
T41.1X2SPoisoning by intravenous anesthetics, intentional self-harm, sequelaCMS: Poisoning by intravenous anesthetics, self-harm, sequelaCan lead a claimANone
T41.1X3 Poisoning by intravenous anesthetics, assault
T41.1X3APoisoning by intravenous anesthetics, assault, initial encounterCMS: Poisoning by intravenous anesthetics, assault, init encntrCan lead a claimANone
T41.1X3DPoisoning by intravenous anesthetics, assault, subsequent encounterCMS: Poisoning by intravenous anesthetics, assault, subs encntrCan lead a claimANone
T41.1X3SPoisoning by intravenous anesthetics, assault, sequelaCan lead a claimANone
T41.1X4 Poisoning by intravenous anesthetics, undetermined
T41.1X4APoisoning by intravenous anesthetics, undetermined, initial encounterCMS: Poisoning by intravenous anesthetics, undetermined, initCan lead a claimANone
T41.1X4DPoisoning by intravenous anesthetics, undetermined, subsequent encounterCMS: Poisoning by intravenous anesthetics, undetermined, subsCan lead a claimANone
T41.1X4SPoisoning by intravenous anesthetics, undetermined, sequelaCan lead a claimANone
T41.1X5 Adverse effect of intravenous anesthetics
T41.1X5AAdverse effect of intravenous anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1X5DAdverse effect of intravenous anesthetics, subsequent encounterCMS: Adverse effect of intravenous anesthetics, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1X5SAdverse effect of intravenous anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1X6 Underdosing of intravenous anesthetics
T41.1X6AUnderdosing of intravenous anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1X6DUnderdosing of intravenous anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.1X6SUnderdosing of intravenous anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.2 Poisoning by, adverse effect of and underdosing of other and unspecified general anesthetics
T41.20 Poisoning by, adverse effect of and underdosing of unspecified general anesthetics
T41.201 Poisoning by unspecified general anesthetics, accidental (unintentional)
T41.201APoisoning by unspecified general anesthetics, accidental (unintentional), initial encounterCMS: Poisoning by unsp general anesthetics, accidental, initCan lead a claimANone
T41.201DPoisoning by unspecified general anesthetics, accidental (unintentional), subsequent encounterCMS: Poisoning by unsp general anesthetics, accidental, subsCan lead a claimANone
T41.201SPoisoning by unspecified general anesthetics, accidental (unintentional), sequelaCMS: Poisoning by unsp general anesthetics, accidental, sequelaCan lead a claimANone
T41.202 Poisoning by unspecified general anesthetics, intentional self-harm
T41.202APoisoning by unspecified general anesthetics, intentional self-harm, initial encounterCMS: Poisoning by unsp general anesthetics, self-harm, initCan lead a claimANone
T41.202DPoisoning by unspecified general anesthetics, intentional self-harm, subsequent encounterCMS: Poisoning by unsp general anesthetics, self-harm, subsCan lead a claimANone
T41.202SPoisoning by unspecified general anesthetics, intentional self-harm, sequelaCMS: Poisoning by unsp general anesthetics, self-harm, sequelaCan lead a claimANone
T41.203 Poisoning by unspecified general anesthetics, assault
T41.203APoisoning by unspecified general anesthetics, assault, initial encounterCMS: Poisoning by unsp general anesthetics, assault, init encntrCan lead a claimANone
T41.203DPoisoning by unspecified general anesthetics, assault, subsequent encounterCMS: Poisoning by unsp general anesthetics, assault, subs encntrCan lead a claimANone
T41.203SPoisoning by unspecified general anesthetics, assault, sequelaCMS: Poisoning by unsp general anesthetics, assault, sequelaCan lead a claimANone
T41.204 Poisoning by unspecified general anesthetics, undetermined
T41.204APoisoning by unspecified general anesthetics, undetermined, initial encounterCMS: Poisoning by unsp general anesthetics, undetermined, initCan lead a claimANone
T41.204DPoisoning by unspecified general anesthetics, undetermined, subsequent encounterCMS: Poisoning by unsp general anesthetics, undetermined, subsCan lead a claimANone
T41.204SPoisoning by unspecified general anesthetics, undetermined, sequelaCMS: Poisoning by unsp general anesthetics, undetermined, sequelaCan lead a claimANone
T41.205 Adverse effect of unspecified general anesthetics
T41.205AAdverse effect of unspecified general anesthetics, initial encounterCMS: Adverse effect of unsp general anesthetics, init encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.205DAdverse effect of unspecified general anesthetics, subsequent encounterCMS: Adverse effect of unsp general anesthetics, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.205SAdverse effect of unspecified general anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.206 Underdosing of unspecified general anesthetics
T41.206AUnderdosing of unspecified general anesthetics, initial encounterCMS: Underdosing of unspecified general anesthetics, init encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.206DUnderdosing of unspecified general anesthetics, subsequent encounterCMS: Underdosing of unspecified general anesthetics, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.206SUnderdosing of unspecified general anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.29 Poisoning by, adverse effect of and underdosing of other general anesthetics
T41.291 Poisoning by other general anesthetics, accidental (unintentional)
T41.291APoisoning by other general anesthetics, accidental (unintentional), initial encounterCMS: Poisoning by oth general anesthetics, accidental, initCan lead a claimANone
T41.291DPoisoning by other general anesthetics, accidental (unintentional), subsequent encounterCMS: Poisoning by oth general anesthetics, accidental, subsCan lead a claimANone
T41.291SPoisoning by other general anesthetics, accidental (unintentional), sequelaCMS: Poisoning by oth general anesthetics, accidental, sequelaCan lead a claimANone
T41.292 Poisoning by other general anesthetics, intentional self-harm
T41.292APoisoning by other general anesthetics, intentional self-harm, initial encounterCMS: Poisoning by oth general anesthetics, self-harm, initCan lead a claimANone
T41.292DPoisoning by other general anesthetics, intentional self-harm, subsequent encounterCMS: Poisoning by oth general anesthetics, self-harm, subsCan lead a claimANone
T41.292SPoisoning by other general anesthetics, intentional self-harm, sequelaCMS: Poisoning by oth general anesthetics, self-harm, sequelaCan lead a claimANone
T41.293 Poisoning by other general anesthetics, assault
T41.293APoisoning by other general anesthetics, assault, initial encounterCMS: Poisoning by other general anesthetics, assault, init encntrCan lead a claimANone
T41.293DPoisoning by other general anesthetics, assault, subsequent encounterCMS: Poisoning by other general anesthetics, assault, subs encntrCan lead a claimANone
T41.293SPoisoning by other general anesthetics, assault, sequelaCan lead a claimANone
T41.294 Poisoning by other general anesthetics, undetermined
T41.294APoisoning by other general anesthetics, undetermined, initial encounterCMS: Poisoning by oth general anesthetics, undetermined, initCan lead a claimANone
T41.294DPoisoning by other general anesthetics, undetermined, subsequent encounterCMS: Poisoning by oth general anesthetics, undetermined, subsCan lead a claimANone
T41.294SPoisoning by other general anesthetics, undetermined, sequelaCMS: Poisoning by oth general anesthetics, undetermined, sequelaCan lead a claimANone
T41.295 Adverse effect of other general anesthetics
T41.295AAdverse effect of other general anesthetics, initial encounterCMS: Adverse effect of other general anesthetics, init encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.295DAdverse effect of other general anesthetics, subsequent encounterCMS: Adverse effect of other general anesthetics, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.295SAdverse effect of other general anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.296 Underdosing of other general anesthetics
T41.296AUnderdosing of other general anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.296DUnderdosing of other general anesthetics, subsequent encounterCMS: Underdosing of other general anesthetics, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.296SUnderdosing of other general anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3 Poisoning by, adverse effect of and underdosing of local anesthetics
T41.3X Poisoning by, adverse effect of and underdosing of local anesthetics
T41.3X1 Poisoning by local anesthetics, accidental (unintentional)
T41.3X1APoisoning by local anesthetics, accidental (unintentional), initial encounterCMS: Poisoning by local anesthetics, accidental, initCan lead a claimANone
T41.3X1DPoisoning by local anesthetics, accidental (unintentional), subsequent encounterCMS: Poisoning by local anesthetics, accidental, subsCan lead a claimANone
T41.3X1SPoisoning by local anesthetics, accidental (unintentional), sequelaCMS: Poisoning by local anesthetics, accidental, sequelaCan lead a claimANone
T41.3X2 Poisoning by local anesthetics, intentional self-harm
T41.3X2APoisoning by local anesthetics, intentional self-harm, initial encounterCMS: Poisoning by local anesthetics, intentional self-harm, initCan lead a claimANone
T41.3X2DPoisoning by local anesthetics, intentional self-harm, subsequent encounterCMS: Poisoning by local anesthetics, intentional self-harm, subsCan lead a claimANone
T41.3X2SPoisoning by local anesthetics, intentional self-harm, sequelaCMS: Poisoning by local anesthetics, self-harm, sequelaCan lead a claimANone
T41.3X3 Poisoning by local anesthetics, assault
T41.3X3APoisoning by local anesthetics, assault, initial encounterCan lead a claimANone
T41.3X3DPoisoning by local anesthetics, assault, subsequent encounterCMS: Poisoning by local anesthetics, assault, subs encntrCan lead a claimANone
T41.3X3SPoisoning by local anesthetics, assault, sequelaCan lead a claimANone
T41.3X4 Poisoning by local anesthetics, undetermined
T41.3X4APoisoning by local anesthetics, undetermined, initial encounterCMS: Poisoning by local anesthetics, undetermined, init encntrCan lead a claimANone
T41.3X4DPoisoning by local anesthetics, undetermined, subsequent encounterCMS: Poisoning by local anesthetics, undetermined, subs encntrCan lead a claimANone
T41.3X4SPoisoning by local anesthetics, undetermined, sequelaCan lead a claimANone
T41.3X5 Adverse effect of local anesthetics
T41.3X5AAdverse effect of local anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3X5DAdverse effect of local anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3X5SAdverse effect of local anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3X6 Underdosing of local anesthetics
T41.3X6AUnderdosing of local anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3X6DUnderdosing of local anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.3X6SUnderdosing of local anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.4 Poisoning by, adverse effect of and underdosing of unspecified anesthetic
T41.41 Poisoning by unspecified anesthetic, accidental (unintentional)
T41.41XAPoisoning by unspecified anesthetic, accidental (unintentional), initial encounterCMS: Poisoning by unsp anesthetic, accidental, initCan lead a claimANone
T41.41XDPoisoning by unspecified anesthetic, accidental (unintentional), subsequent encounterCMS: Poisoning by unsp anesthetic, accidental, subsCan lead a claimANone
T41.41XSPoisoning by unspecified anesthetic, accidental (unintentional), sequelaCMS: Poisoning by unsp anesthetic, accidental, sequelaCan lead a claimANone
T41.42 Poisoning by unspecified anesthetic, intentional self-harm
T41.42XAPoisoning by unspecified anesthetic, intentional self-harm, initial encounterCMS: Poisoning by unsp anesthetic, intentional self-harm, initCan lead a claimANone
T41.42XDPoisoning by unspecified anesthetic, intentional self-harm, subsequent encounterCMS: Poisoning by unsp anesthetic, intentional self-harm, subsCan lead a claimANone
T41.42XSPoisoning by unspecified anesthetic, intentional self-harm, sequelaCMS: Poisoning by unsp anesthetic, intentional self-harm, sequelaCan lead a claimANone
T41.43 Poisoning by unspecified anesthetic, assault
T41.43XAPoisoning by unspecified anesthetic, assault, initial encounterCMS: Poisoning by unspecified anesthetic, assault, init encntrCan lead a claimANone
T41.43XDPoisoning by unspecified anesthetic, assault, subsequent encounterCMS: Poisoning by unspecified anesthetic, assault, subs encntrCan lead a claimANone
T41.43XSPoisoning by unspecified anesthetic, assault, sequelaCan lead a claimANone
T41.44 Poisoning by unspecified anesthetic, undetermined
T41.44XAPoisoning by unspecified anesthetic, undetermined, initial encounterCMS: Poisoning by unsp anesthetic, undetermined, init encntrCan lead a claimANone
T41.44XDPoisoning by unspecified anesthetic, undetermined, subsequent encounterCMS: Poisoning by unsp anesthetic, undetermined, subs encntrCan lead a claimANone
T41.44XSPoisoning by unspecified anesthetic, undetermined, sequelaCan lead a claimANone
T41.45 Adverse effect of unspecified anesthetic
T41.45XAAdverse effect of unspecified anesthetic, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.45XDAdverse effect of unspecified anesthetic, subsequent encounterCMS: Adverse effect of unspecified anesthetic, subs encntrCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.45XSAdverse effect of unspecified anesthetic, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.46 Underdosing of unspecified anesthetics
T41.46XAUnderdosing of unspecified anesthetics, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.46XDUnderdosing of unspecified anesthetics, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.46XSUnderdosing of unspecified anesthetics, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5 Poisoning by, adverse effect of and underdosing of therapeutic gases
T41.5X Poisoning by, adverse effect of and underdosing of therapeutic gases
T41.5X1 Poisoning by therapeutic gases, accidental (unintentional)
T41.5X1APoisoning by therapeutic gases, accidental (unintentional), initial encounterCMS: Poisoning by therapeutic gases, accidental, initCan lead a claimANone
T41.5X1DPoisoning by therapeutic gases, accidental (unintentional), subsequent encounterCMS: Poisoning by therapeutic gases, accidental, subsCan lead a claimANone
T41.5X1SPoisoning by therapeutic gases, accidental (unintentional), sequelaCMS: Poisoning by therapeutic gases, accidental, sequelaCan lead a claimANone
T41.5X2 Poisoning by therapeutic gases, intentional self-harm
T41.5X2APoisoning by therapeutic gases, intentional self-harm, initial encounterCMS: Poisoning by therapeutic gases, intentional self-harm, initCan lead a claimANone
T41.5X2DPoisoning by therapeutic gases, intentional self-harm, subsequent encounterCMS: Poisoning by therapeutic gases, intentional self-harm, subsCan lead a claimANone
T41.5X2SPoisoning by therapeutic gases, intentional self-harm, sequelaCMS: Poisoning by therapeutic gases, self-harm, sequelaCan lead a claimANone
T41.5X3 Poisoning by therapeutic gases, assault
T41.5X3APoisoning by therapeutic gases, assault, initial encounterCan lead a claimANone
T41.5X3DPoisoning by therapeutic gases, assault, subsequent encounterCMS: Poisoning by therapeutic gases, assault, subs encntrCan lead a claimANone
T41.5X3SPoisoning by therapeutic gases, assault, sequelaCan lead a claimANone
T41.5X4 Poisoning by therapeutic gases, undetermined
T41.5X4APoisoning by therapeutic gases, undetermined, initial encounterCMS: Poisoning by therapeutic gases, undetermined, init encntrCan lead a claimANone
T41.5X4DPoisoning by therapeutic gases, undetermined, subsequent encounterCMS: Poisoning by therapeutic gases, undetermined, subs encntrCan lead a claimANone
T41.5X4SPoisoning by therapeutic gases, undetermined, sequelaCan lead a claimANone
T41.5X5 Adverse effect of therapeutic gases
T41.5X5AAdverse effect of therapeutic gases, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5X5DAdverse effect of therapeutic gases, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5X5SAdverse effect of therapeutic gases, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5X6 Underdosing of therapeutic gases
T41.5X6AUnderdosing of therapeutic gases, initial encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5X6DUnderdosing of therapeutic gases, subsequent encounterCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone
T41.5X6SUnderdosing of therapeutic gases, sequelaCannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosisNoneNone

Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.

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