A50.55

Late congenital syphilitic arthropathy

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

Exclusions 8 never code together

Excludes1

Excludes2

Excludes1

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 3

Inclusion terms

Any congenital syphilitic condition specified as late or manifest two years or more after birth.

Includes

Use additional code

Index entries leading here 4

Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
- syphilitic (late) A52.16
  - congenital A50.55
Syphilis, syphilitic (acquired) A53.9
- congenital A50.9
  - late, or 2 years or more after birth NEC A50.7
    - symptomatic or with manifestations NEC A50.59
      - arthropathy A50.55
Arthropathy M12.9
- in (due to)
  - syphilis (late) A52.77
    - congenital A50.55
Hydrarthrosis — see also Effusion, joint
- syphilitic (late) A52.77
  - congenital A50.55

Alongside this code 7 same parent — A50.5

Additional references

AHA Coding Clinic® Licence required

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

CMS22HCC39 CMS28HCC92 ESRD21HCC39 ESRD24HCC39

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

Present FY2024–FY2027.