ICD-10-CM 2027
ICD-10 code for proctitis chlamydia
From the official ICD-10-CM alphabetic index entry “Chlamydia, chlamydial › proctitis”. Page updated September 29, 2026.
About coding proctitis chlamydia
The ICD-10-CM code for proctitis chlamydia is A56.3 (Chlamydial infection of anus and rectum).
Within A56 (other sexually transmitted chlamydial diseases), A56.3 is specifically for chlamydial infection of anus and rectum. Related codes cover chlamydial infection of lower genitourinary tract (A56.0), chlamydial infection of pelviperitoneum and other genitourinary organs (A56.1), chlamydial infection of genitourinary tract, unspecified (A56.2), chlamydial infection of pharynx (A56.4) and sexually transmitted chlamydial infection of other sites (A56.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about proctitis chlamydia ICD-10 codes
What is the ICD-10 code for proctitis chlamydia?
- A56.3 — Chlamydial infection of anus and rectum.
Is A56.3 billable?
- Yes. A56.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A56.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A56.3 as a principal diagnosis.
Is A56.3 a CC or MCC?
- No. A56.3 is neither a CC nor an MCC under MS-DRG v44.0.