A56.01 ICD-10-CM Code: Chlamydial cystitis and urethritis
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 727 — INFLAMMATION OF THE MALE REPRODUCTIVE SYSTEM WITH MCC (MDC 12)
- MS-DRG 728 — INFLAMMATION OF THE MALE REPRODUCTIVE SYSTEM WITHOUT MCC (MDC 12)
- MS-DRG 742 — UTERINE AND ADNEXA PROCEDURES FOR NON-MALIGNANCY WITH CC/MCC (MDC 13)
- MS-DRG 743 — UTERINE AND ADNEXA PROCEDURES FOR NON-MALIGNANCY WITHOUT CC/MCC (MDC 13)
- MS-DRG 757 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITH MCC (MDC 13)
- MS-DRG 758 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITH CC (MDC 13)
- MS-DRG 759 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITHOUT CC/MCC (MDC 13)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for A56.01 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
- nonspecific and nongonococcal urethritis (N34.1)
- Reiter's disease (M02.3-)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- chlamydial lymphogranuloma (A55)
- conditions classified to A74.-
- human immunodeficiency virus [HIV] disease (B20)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to A56.01 in its code family, with their registry titles.
- A56 — Other sexually transmitted chlamydial diseases
- A56.0 — Chlamydial infection of lower genitourinary tract
- A56.00 — Chlamydial infection of lower genitourinary tract, unspecified
- A56.02 — Chlamydial vulvovaginitis
- A56.09 — Other chlamydial infection of lower genitourinary tract
- A56.1 — Chlamydial infection of pelviperitoneum and other genitourinary organs
- A56.11 — Chlamydial female pelvic inflammatory disease
- A56.19 — Other chlamydial genitourinary infection
- A56.2 — Chlamydial infection of genitourinary tract, unspecified
- A56.3 — Chlamydial infection of anus and rectum
Indexed Clinical Terms (4)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Chlamydia, chlamydial, cystitis
- Chlamydia, chlamydial, urethritis
- Cystitis (exudative) (hemorrhagic) (septic) (suppurative), chlamydial
- Urethritis (anterior) (posterior), chlamydial