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ICD10

ICD-10 Code A51.3: Secondary syphilis of skin and mucous membranes

A51.3 is an ICD-10 diagnosis entry used to group records related to Secondary syphilis of skin and mucous membranes. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

  • May be used when a clinician documents secondary syphilis of skin and mucous membranes in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A50-A64Infections with a predominantly sexual mode of transmission
category
A51Early syphilis
currentA51

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral PhysicianDermatologist

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
A51.3
Replacement codes
A51.31 — Condyloma latumA51.32 — Syphilitic alopeciaA51.39 — Other secondary syphilis of skin

Common synonyms

Secondary syphilis of skin and mucous membranes

Frequently asked questions

Code details

CodeA51.3
SystemICD10
Display nameSecondary syphilis of skin and mucous membranes
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockInfections with a predominantly sexual mode of transmission

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.