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

J4A Chronic lung allograft dysfunction

All 3 codes in the J4A 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

3

Can lead a claim

3

Cannot lead a claim

0

What CMS assigns to J4A

All 3 codes group to MMTA - Respiratory. All 3 count toward the Chronic Obstructive Pulmonary Disease, Asthma, and Bronchiectasis comorbidity subgroup. Every code can lead a claim. CMS attaches a code-first note to all 3.

  • Chronic Obstructive Pulmonary Disease, Asthma, and Bronchiectasis: counts toward the high comorbidity tier only in an interaction pair.

Code first

CMS grouper convention 87, on all 3 codes. Code first:

  • , if applicable:
  • heart-lung transplant rejection (T86.31)
  • lung transplant rejection (T86.810)
  • other complications of heart-lung transplant (T86.39)
  • other complications of lung transplant (T86.818)

Every code in J4A

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

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
J4A.0Restrictive allograft syndromeCan lead a claim, code first appliesLChronic Obstructive Pulmonary Disease, Asthma, and Bronchiectasis
J4A.8Other chronic lung allograft dysfunctionCan lead a claim, code first appliesLChronic Obstructive Pulmonary Disease, Asthma, and Bronchiectasis
J4A.9Chronic lung allograft dysfunction, unspecifiedCan lead a claim, code first appliesLChronic Obstructive Pulmonary Disease, Asthma, and Bronchiectasis

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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