A56 — Other sexually transmitted chlamydial diseases
Is A56 billable?
No — A56 is a non-billable header code. A56 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 10 billable codes beneath A56.
Billable codes under this header
- A56.2Chlamydial infection of genitourinary tract, unspecified
- A56.3Chlamydial infection of anus and rectum
- A56.4Chlamydial infection of pharynx
- A56.8Sexually transmitted chlamydial infection of other sites
- A56.00Chlamydial infection of lower genitourinary tract, unspecified
- A56.01Chlamydial cystitis and urethritis
- A56.02Chlamydial vulvovaginitis
- A56.09Other chlamydial infection of lower genitourinary tract
- A56.11Chlamydial female pelvic inflammatory disease
- A56.19Other chlamydial genitourinary infection
A56 at a glance
| Code | A56 |
|---|---|
| Description | Other sexually transmitted chlamydial diseases |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with A56 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here
The conditions below are not part of A56, but a patient may have both at the same time. When documentation supports it, A56 and the excluded code may both be reported.
Includes
Conditions classified to A56.
- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes1 — never code together — inherited from A50-A64
The conditions below can never be reported together with A56 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 1
Report an additional code alongside A56 to fully describe the condition. A56 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A56, but a patient may have both at the same time. When documentation supports it, A56 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Excludes2 — not included here — inherited from A50-A64
The conditions below are not part of A56, but a patient may have both at the same time. When documentation supports it, A56 and the excluded code may both be reported.
- human immunodeficiency virus [HIV] disease (B20)
What codes fall under A56? (6)
- A56.0Chlamydial infection of lower genitourinary tractnot billable
- A56.1Chlamydial infection of pelviperitoneum and other genitourinary organsnot billable
- A56.2Chlamydial infection of genitourinary tract, unspecified
- A56.3Chlamydial infection of anus and rectum
- A56.4Chlamydial infection of pharynx
- A56.8Sexually transmitted chlamydial infection of other sites
How long has A56 existed?
A56 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with A56?
ICD-10-CM declares these codes mutually exclusive with A56 — exactly one of each pair can be correct for a given encounter.