ICD-10 · PDGM grouping
K21 Gastro-esophageal reflux disease
All 3 codes in the K21 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.
Codes in family
3
Can lead a claim
3
Cannot lead a claim
0
What CMS assigns to K21
All 3 codes group to MMTA - Gastrointestinal tract and Genitourinary system. None of the 3 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in K21
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| K21.0 Gastro-esophageal reflux disease with esophagitis | ||||
| K21.00 | Gastro-esophageal reflux disease with esophagitis, without bleedingCMS: Gastro-esophageal reflux dis with esophagitis, without bleed | Can lead a claim | J | None |
| K21.01 | Gastro-esophageal reflux disease with esophagitis, with bleedingCMS: Gastro-esophageal reflux dis with esophagitis, with bleed | Can lead a claim | J | None |
| K21.9 | Gastro-esophageal reflux disease without esophagitis | Can lead a claim | J | None |
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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