2027 ICD-10-CM Diagnosis Code A52.79Other symptomatic late syphilis

ICD-10-CM Codes›A00–B99›A50-A64›A52

ICD-10-CM A52.79
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A52.79 is a billable ICD-10-CM diagnosis code for other symptomatic late syphilis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 149 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A52.79
Billable Status
Yes — Valid for Submission
Code Describes
Other symptomatic late syphilis
Short Description
Other symptomatic late syphilis
Same as the full description in the CMS dataset.
Parent Code
A52.7
Other symptomatic late syphilis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA52Late syphilis
This CodeA52.79Other symptomatic late syphilis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Endocochlear syphilis
  • Infection involving inner ear
  • Late syphilis of mucous membrane
  • Late syphilis of skin
  • Late syphilis with clinical manifestations other than neurosyphilis
  • Leukoplakia of tongue
  • Nodular syphilide
  • Oral mucous membrane lesion due to late syphilis
  • Oral syphilis
  • Syphilis of breast
  • Syphilitic gumma
  • Syphilitic gumma of oral cavity
  • Syphilitic leukoplakia of tongue
  • Syphilitic oral leukoplakia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A52.79: its own notes plus those printed at block A50-A64 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Late syphilitic leukoderma
  • Syphilis of adrenal gland
  • Syphilis of pituitary gland
  • Syphilis of thyroid gland
  • Syphilitic splenomegaly

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On A52.79 itself
  • syphilitic leukoderma (secondary) (A51.39)
From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • nonspecific and nongonococcal urethritis (N34.1)
  • Reiter's disease (M02.3-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • human immunodeficiency virus [HIV] disease (B20)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A52.79, its category, or a range that includes it.

Applicable To 1

These notes mention A52.79.

  • O98.1 Syphilis complicating pregnancy, childbirth and the puerperium
    Conditions in A50-A53 names A50-A53, which includes this code

Excludes1 7

These codes carry an Excludes1 note naming A52.79: they are not reported together with it, unless the two conditions are unrelated.

  • A51.39 Other secondary syphilis of skin
    late syphilitic leukoderma (A52.79)
  • D73.1 Hypersplenism
    splenitis, splenomegaly in late syphilis (A52.79)
  • D77 Other disorders of blood and blood-forming organs in diseases classified elsewhere
    splenitis, splenomegaly in late syphilis (A52.79)
  • E35 Disorders of endocrine glands in diseases classified elsewhere
    syphilis of endocrine gland (A52.79)
  • H94.8 Other specified disorders of ear in diseases classified elsewhere
    syphilitic labyrinthitis (A52.79)
  • K23 Disorders of esophagus in diseases classified elsewhere
    late syphilis (A52.79)
  • L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
    skin disorders in syphilis (A51.31, A52.79)

Excludes2 1

These codes carry an Excludes2 note naming A52.79: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block A65-A69 Other spirochetal diseases
    syphilis (A50-A53) names A50-A53, which includes this code

Code First 1

These codes say to code first a condition named in the note, and A52.79 is one of the conditions named.

  • D63.8 Anemia in other chronic diseases classified elsewhere
    symptomatic late syphilis (A52.79)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Tertiary Syphilis

    a stage of syphilis that occurs fifteen to thirty years after the initial infection; it can include gumma formation and cardiovascular or central nervous system involvement (neurosyphilis).

Patient EducationClinical

Syphilis

Syphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both men and women. You usually get syphilis from sexual contact with someone who has it. It can also pass from mother to baby during pregnancy.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A52.79 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
095.8 Late sympt syphilis NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
095.9 Late sympt syphilis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A52.79Overview

What is the ICD-10 code for other symptomatic late syphilis?

The ICD-10-CM code for other symptomatic late syphilis is A52.79 (sometimes written as A5279). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A52.79 (Other symptomatic late syphilis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other symptomatic late syphilis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A52.79 group to?

When other symptomatic late syphilis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A52.79 a CC or MCC?

CMS lists A52.79 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 149 closely related codes in its exclusion list.

Can A52.79 be reported with A51.39?

Not as a rule. The Excludes1 note on A52.79 lists "syphilitic leukoderma (secondary) (A51.39)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).