A39.84 — Postmeningococcal arthritis
A39.84 is a billable, specific ICD-10-CM code for postmeningococcal arthritis. It is valid for submission on a claim.
Other codes that can never be billed with A39.84
These codes carry an Excludes1 note pointing at A39.84. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A39.84 alone.
Risk adjustment
A39.84 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 92 Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis0.479 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
A39.84 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54061Billing and Coding: Arthroscopic Lavage and Arthroscopic Debridement for Osteoarthritic Knees
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How A39.84 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to A39.84.
- Arthritis, arthritic›postmeningococcal
Related codes at this level
Codes that share A39.8. If A39.84 is not quite right, the correct code is usually one of these.
Questions about A39.84
- Is A39.84 a billable ICD-10-CM code?
- Yes. A39.84 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does A39.84 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other bacterial diseases (A30-A49).