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ICD-10-CM 2027 diagnosis code

A52.04Syphilitic cerebral arteritis

✓ Billable / specificCC — complication/comorbidity

A52.04 is a valid, billable ICD-10-CM code for syphilitic cerebral arteritis. 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 A52.04

A52.04 is the ICD-10-CM diagnosis code for syphilitic cerebral arteritis. It belongs to category A52 (late syphilis), block A50-A64 (infections with a predominantly sexual mode of transmission) 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 A52.0 (cardiovascular and cerebrovascular syphilis), A52.04 is specifically for syphilitic cerebral arteritis. Related codes cover cardiovascular syphilis, unspecified (A52.00), syphilitic aneurysm of aorta (A52.01), syphilitic aortitis (A52.02), syphilitic endocarditis (A52.03), other cerebrovascular syphilis (A52.05), other syphilitic heart involvement (A52.06) and other cardiovascular syphilis (A52.09).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), in MDC 05 (Diseases and Disorders of the Circulatory System), 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 093.89 (other specified cardiovascular syphilis).

Notes that apply from higher levels

Instructions written at a parent level also apply to A52.04.

Broader instructions also apply from A50-A64 Infections with a predominantly sexual mode of transmission and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

7 entries

Terms in the official ICD-10-CM index that lead to A52.04.

Codes whose notes reference A52.04

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.

ICD-9-CM equivalent

Converter →
  • 093.89Other specified cardiovascular syphilisapproximate

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 A52.04

Is A52.04 billable?

Yes. A52.04 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A52.04 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A52.04 as a principal diagnosis.

Is A52.04 a CC or MCC?

A52.04 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A52.04 group to?

A52.04 is used in the MS-DRG v44.0 logic for MS-DRG 314 (Other Circulatory System Diagnoses with MCC), MS-DRG 315 (Other Circulatory System Diagnoses with CC) and MS-DRG 316 (Other Circulatory System Diagnoses without CC/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 A52.04?

The CMS General Equivalence Mappings map A52.04 to ICD-9-CM 093.89.