G93.31 — Postviral fatigue syndrome
G93.31 is a billable, specific ICD-10-CM code for postviral fatigue syndrome. It is valid for submission on a claim.
Excludes1 inherited from the categories above G93.31
These are not written on G93.31, but they bind it: a note on a category applies to every code beneath it. Billing G93.31 with anything listed here is a denial.
Other codes that can never be billed with G93.31
These codes carry an Excludes1 note pointing at G93.31. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G93.31 alone.
- R53.82Chronic fatigue, unspecified
Risk adjustment
G93.31 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G93.31 is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54969Billing and Coding: Nerve Conduction Studies and Electromyography
- A57122Billing and Coding: Parathormone (Parathyroid Hormone)
- A57205Billing and Coding: Oximetry Services
- A57307Billing and Coding: Nerve Conduction Studies and Electromyography
How G93.31 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 G93.31.
- Syndrome›postviral NEC
- Syndrome›fatigue›postviral
- Syndrome›postviral NEC›fatigue
Code history
G93.31 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share G93.3. If G93.31 is not quite right, the correct code is usually one of these.
Questions about G93.31
- Is G93.31 a billable ICD-10-CM code?
- Yes. G93.31 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G93.31 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).
- What cannot be coded together with G93.31?
- G93.31 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above G93.31 (G93.3) and apply to it just the same.