E83.42 — Hypomagnesemia
E83.42 is a billable, specific ICD-10-CM code for hypomagnesemia. It is valid for submission on a claim.
Risk adjustment
E83.42 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
E83.42 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57122Billing and Coding: Parathormone (Parathyroid Hormone)
- A57189Billing and Coding: Serum Magnesium
- A57326Billing and Coding: Electrocardiograms
- A59186Billing and Coding: Magnesium
How E83.42 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 E83.42.
- Hypomagnesemia
- Disorder›metabolism NOS›magnesium›hypomagnesemia
Related codes at this level
Codes that share E83.4. If E83.42 is not quite right, the correct code is usually one of these.
Questions about E83.42
- Is E83.42 a billable ICD-10-CM code?
- Yes. E83.42 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E83.42 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Metabolic disorders (E70-E88).