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ICD-10-CM Codes
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A00-B99
Certain infectious and parasitic diseases
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A50-A64
Infections with a predominantly sexual mode of transmission
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A56-
Other sexually transmitted chlamydial diseases
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2021 ICD-10-CM Diagnosis Code A56
2021 ICD-10-CM Diagnosis Code A56
Other sexually transmitted chlamydial diseases
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
- A56 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
- The 2021 edition of ICD-10-CM A56 became effective on October 1, 2020.
- This is the American ICD-10-CM version of A56 - other international versions of ICD-10 A56 may differ.
Type 1 ExcludesType 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as A56. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Type 2 ExcludesType 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (A56) and the excluded code together.
IncludesIncludes Help
"Includes" further defines, or give examples of, the content of the code or category.
- sexually transmitted diseases due to Chlamydia
- trachomatis
The following code(s) above
A56 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
A56:
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To A56
A54.8 Other gonococcal infections
A54.82 Gonococcal brain abscess
A54.83 Gonococcal heart infection
A54.89 Other gonococcal infections
A54.9 Gonococcal infection, unspecified
A55 Chlamydial lymphogranuloma (venereum)
A56
Other sexually transmitted chlamydial diseases
A56.0 Chlamydial infection of lower genitourinary tract
A56.01 Chlamydial cystitis and urethritis
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
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
