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

E03 Other hypothyroidism

All 8 codes in the E03 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

8

Can lead a claim

8

Cannot lead a claim

0

What CMS assigns to E03

All 8 codes group to MMTA - Endocrine. 4 of the 8 count toward the Hypothyroidism comorbidity subgroup; 4 are assigned none. Every code can lead a claim. CMS attaches a code-first note to 1 of the 8.

  • Hypothyroidism: counts toward the high comorbidity tier only in an interaction pair.

Code first

CMS grouper convention 13, on E03.2. Code first:

  • poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)

Every code in E03

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

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
E03.0Congenital hypothyroidism with diffuse goiterCan lead a claimINone
E03.1Congenital hypothyroidism without goiterCan lead a claimINone
E03.2Hypothyroidism due to medicaments and other exogenous substancesCMS: Hypothyroidism due to meds and oth exogenous substancesCan lead a claim, code first appliesIHypothyroidism
E03.3Postinfectious hypothyroidismCan lead a claimIHypothyroidism
E03.4Atrophy of thyroid (acquired)Can lead a claimINone
E03.5Myxedema comaCan lead a claimINone
E03.8Other specified hypothyroidismCan lead a claimIHypothyroidism
E03.9Hypothyroidism, unspecifiedCan lead a claimIHypothyroidism

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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