ICD-10-CM 2027
ICD-10 code for organic syphilis
From the official ICD-10-CM alphabetic index entry “Syphilis, syphilitic (acquired) › organic”. Page updated September 29, 2026.
About coding organic syphilis
The ICD-10-CM code for organic syphilis is A53.9 (Syphilis, unspecified).
Within A53, choose A53.9 (Syphilis, unspecified) only when documentation doesn't support a more specific option: latent syphilis, unspecified as early or late (A53.0).
Don't report A53.9 together with the conditions in its Excludes1 note: syphilis NOS under two years of age (A50.2).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for A53.9)
- syphilis NOS under two years of age (A50.2)
Common questions about organic syphilis ICD-10 codes
What is the ICD-10 code for organic syphilis?
- A53.9 — Syphilis, unspecified.
Is A53.9 billable?
- Yes. A53.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A53.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A53.9 as a principal diagnosis.
Is A53.9 a CC or MCC?
- No. A53.9 is neither a CC nor an MCC under MS-DRG v44.0.