Is A56.00 a billable ICD-10-CM code?

Yes. A56.00 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does A56.00 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Infections with a predominantly sexual mode of transmission (A50-A64).

What cannot be coded together with A56.00?

A56.00 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above A56.00 (A56) and apply to it just the same.

A56.00

A56.00 — Chlamydial infection of lower genitourinary tract, unspecified

Billable / specific codeICD-10-CM

A56.00 is a billable, specific ICD-10-CM code for chlamydial infection of lower genitourinary tract, unspecified. It is valid for submission on a claim.

Excludes1 inherited from the categories above A56.00

These are not written on A56.00, but they bind it: a note on a category applies to every code beneath it. Billing A56.00 with anything listed here is a denial.

Written on A56 — Other sexually transmitted chlamydial diseases

neonatal chlamydial conjunctivitis (P39.1)
neonatal chlamydial pneumonia (P23.1)

Excludes2 inherited from the categories above A56.00

Also inherited, and the opposite of Excludes1: these conditions are not part of A56.00, but a patient can have both, so you may code both.

Written on A56 — Other sexually transmitted chlamydial diseases

chlamydial lymphogranuloma (A55)
conditions classified to A74.-

Risk adjustment

A56.00 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

A56.00 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A58710Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
A58720Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
A58747Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
A58761Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing

How A56.00 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to A56.00.

Infection, infected, infective›Chlamydia, chlamydial›genitourinary tract›lower

Code history

A56.00 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share A56.0. If A56.00 is not quite right, the correct code is usually one of these.

Questions about A56.00

Is A56.00 a billable ICD-10-CM code?: Yes. A56.00 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does A56.00 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Infections with a predominantly sexual mode of transmission (A50-A64).
What cannot be coded together with A56.00?: A56.00 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above A56.00 (A56) and apply to it just the same.