E20.818 — Other specified hypoparathyroidism due to impaired parathyroid hormone secretion
E20.818 is a billable, specific ICD-10-CM code for other specified hypoparathyroidism due to impaired parathyroid hormone secretion. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Familial isolated hypoparathyroidism
Risk adjustment
E20.818 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
E20.818 is named in 10 Medicare coverage policies — 10 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56416Billing and Coding: Assays for Vitamins and Metabolic Function
- A56798Billing and Coding: Vitamin D Assay Testing
- A56841Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed
- A57122Billing and Coding: Parathormone (Parathyroid Hormone)
How E20.818 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 E20.818.
- Hypoparathyroidism›familial›isolated
- Hypoparathyroidism›specified NEC›due to impaired parathyroid hormone secretion
Related codes at this level
Codes that share E20.81. If E20.818 is not quite right, the correct code is usually one of these.
Questions about E20.818
- Is E20.818 a billable ICD-10-CM code?
- Yes. E20.818 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E20.818 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of other endocrine glands (E20-E35).