E79.1 — Lesch-Nyhan syndrome
E79.1 is a billable, specific ICD-10-CM code for lesch-nyhan syndrome. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- HGPRT deficiency
Excludes1 inherited from the categories above E79.1
These are not written on E79.1, but they bind it: a note on a category applies to every code beneath it. Billing E79.1 with anything listed here is a denial.
Written on E79 — Disorders of purine and pyrimidine metabolism
Other codes that can never be billed with E79.1
These codes carry an Excludes1 note pointing at E79.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E79.1 alone.
Risk adjustment
E79.1 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 50 Amyloidosis, Porphyria, and Other Specified Metabolic Disorders0.648 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.
How E79.1 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 E79.1.
- Lesch-Nyhan syndrome
- Deficiency, deficient›hypoxanthine-(guanine)-phosphoribosyltransferase (HG- PRT) (total H-PRT)
- Arthropathy›gouty›in›Lesch-Nyhan syndrome
Code history
E79.1 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 E79. If E79.1 is not quite right, the correct code is usually one of these.
Questions about E79.1
- Is E79.1 a billable ICD-10-CM code?
- Yes. E79.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E79.1 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Metabolic disorders (E70-E88).
- What cannot be coded together with E79.1?
- E79.1 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 E79.1 (E79) and apply to it just the same.