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

N20 Calculus of kidney and ureter

All 4 codes in the N20 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

4

Can lead a claim

3

Cannot lead a claim

1

What CMS assigns to N20

3 of the 4 codes group to MMTA - Gastrointestinal tract and Genitourinary system; 1 is assigned no clinical group. 2 of the 4 count toward the Other disorders of the kidney and ureter, excluding chronic kidney disease and ESRD comorbidity subgroup; 2 are assigned none. 3 of the 4 can lead a claim.

  • Other disorders of the kidney and ureter, excluding chronic kidney disease and ESRD: counts toward the high comorbidity tier only in an interaction pair.

Every code in N20

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

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
N20.0Calculus of kidneyCan lead a claimJOther disorders of the kidney and ureter, excluding chronic kidney disease and ESRD
N20.1Calculus of ureterCan lead a claimJNone
N20.2Calculus of kidney with calculus of ureterCan lead a claimJOther disorders of the kidney and ureter, excluding chronic kidney disease and ESRD
N20.9Urinary calculus, unspecifiedCannot lead a claimPrincipal diagnosis not assigned to a clinical groupNoneNone

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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