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A51.49

Other secondary syphilitic conditions

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 8 never code together

Excludes1

nonspecific and nongonococcal urethritis (N34.1)N34.1
Reiter's disease (M02.3-)M02.3-

Excludes2

human immunodeficiency virus [HIV] disease (B20)B20

A00-B99chapter

Excludes1

certain localized infections - see body system-related chapters

Excludes2

carrier or suspected carrier of infectious disease (Z22.-)Z22.-
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)O98.-
infectious and parasitic diseases specific to the perinatal period (P35-P39)P35-P39
influenza and other acute respiratory infections (J00-J22)J00-J22

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 4

Inclusion terms

Secondary syphilitic lymphadenopathy
Secondary syphilitic myositis

A00-B99chapter

Includes

diseases generally recognized as communicable or transmissible

Use additional code

code to identify resistance to antimicrobial drugs (Z16.-)Z16.-

Index entries leading here 5

Syphilis, syphilitic (acquired) A53.9
- secondary (and primary) A51.49
  - adenopathy A51.49
  - lymphadenitis A51.49
  - relapse (treated, untreated) A51.49
  - specified form NEC A51.49
  - viscera NEC A51.49
- adenopathy (secondary) A51.49
- early A51.9
  - symptomatic A51.9
    - secondary A51.39
      - relapse (treated, untreated) A51.49
- lymphadenitis (secondary) A51.49
- lymph gland (early) (secondary) A51.49
- viscera (abdominal) (late) A52.74
  - secondary A51.49
Adenopathy (lymph gland) R59.9
- syphilitic (secondary) A51.49
Myositis M60.9
- in (due to)
  - syphilis
    - secondary A51.49
Lymphadenitis I88.9
- syphilitic (early) (secondary) A51.49
Lymphadenopathy (generalized) R59.1
- syphilitic (early) (secondary) A51.49

Alongside this code 6 same parent — A51.4

A51.41 Secondary syphilitic meningitis A51.42 Secondary syphilitic female pelvic disease A51.43 Secondary syphilitic oculopathy A51.44 Secondary syphilitic nephritis A51.45 Secondary syphilitic hepatitis A51.46 Secondary syphilitic osteopathy

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: A51.4
Block: A50-A64
Siblings: 6

Present FY2024–FY2027.