ICD-10 · PDGM grouping
A56 Other sexually transmitted chlamydial diseases
All 10 codes in the A56 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
10
Can lead a claim
10
Cannot lead a claim
0
What CMS assigns to A56
All 10 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. None of the 10 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in A56
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 |
|---|---|---|---|---|
| A56.0 Chlamydial infection of lower genitourinary tract | ||||
| A56.00 | Chlamydial infection of lower genitourinary tract, unspecifiedCMS: Chlamydial infection of lower genitourinary tract, unsp | Can lead a claim | K | None |
| A56.01 | Chlamydial cystitis and urethritis | Can lead a claim | K | None |
| A56.02 | Chlamydial vulvovaginitis | Can lead a claim | K | None |
| A56.09 | Other chlamydial infection of lower genitourinary tract | Can lead a claim | K | None |
| A56.1 Chlamydial infection of pelviperitoneum and other genitourinary organs | ||||
| A56.11 | Chlamydial female pelvic inflammatory disease | Can lead a claim | K | None |
| A56.19 | Other chlamydial genitourinary infection | Can lead a claim | K | None |
| A56.2 | Chlamydial infection of genitourinary tract, unspecified | Can lead a claim | K | None |
| A56.3 | Chlamydial infection of anus and rectum | Can lead a claim | K | None |
| A56.4 | Chlamydial infection of pharynx | Can lead a claim | K | None |
| A56.8 | Sexually transmitted chlamydial infection of other sites | Can lead a claim | K | 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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