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ICD-10-CM 2027 diagnosis code

A74.89Other chlamydial diseases

✓ Billable / specific

A74.89 is a valid, billable ICD-10-CM code for other chlamydial diseases. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A74.89

A74.89 is the ICD-10-CM diagnosis code for other chlamydial diseases. It belongs to category A74 (other diseases caused by chlamydiae), block A70-A74 (other diseases caused by chlamydiae) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A74.8, choose A74.89 (Other chlamydial diseases) only when documentation doesn't support a more specific option: chlamydial peritonitis (A74.81).

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 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 078.88 (other specified diseases due to chlamydiae).

Notes that apply from higher levels

Instructions written at a parent level also apply to A74.89.

› From A74 Other diseases caused by chlamydiae
Excludes1
  • neonatal chlamydial conjunctivitis (P39.1)
  • neonatal chlamydial pneumonia (P23.1)
  • Reiter's disease (M02.3-)
  • sexually transmitted chlamydial diseases (A55-A56)
Excludes2
  • chlamydial pneumonia (J16.0)

Broader instructions also apply from A70-A74 Other diseases caused by chlamydiae and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to A74.89.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 18 · Infectious and Parasitic Diseases, Systemic or Unspecified Sites

ICD-9-CM equivalent

Converter →
  • 078.88Other specified diseases due to chlamydiaeapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A74.89

Is A74.89 billable?

Yes. A74.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A74.89 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A74.89 as a principal diagnosis.

Is A74.89 a CC or MCC?

No. A74.89 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does A74.89 group to?

A74.89 is used in the MS-DRG v44.0 logic for MS-DRG 865 (Viral Illness with MCC) and MS-DRG 866 (Viral Illness without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A74.89?

The CMS General Equivalence Mappings map A74.89 to ICD-9-CM 078.88.