ICD-10 · PDGM grouping
E20 Hypoparathyroidism
All 9 codes in the E20 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
9
Can lead a claim
8
Cannot lead a claim
1
What CMS assigns to E20
8 of the 9 codes group to MMTA - Endocrine; 1 is assigned no clinical group. None of the 9 is assigned a comorbidity subgroup. 8 of the 9 can lead a claim. CMS attaches a code-first note to 2 of the 9.
Code first
CMS grouper convention 12, on E20.811. Code first:
- underlying disease
CMS grouper convention 21, on E20.812. Code first:
- , if applicable, underlying condition such as:
- Schmidt's syndrome (E31.0)
- autoimmune polyglandular failure (E31.0)
Every code in E20
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| E20.0 | Idiopathic hypoparathyroidism | Can lead a claim | I | None |
| E20.1 | Pseudohypoparathyroidism | Can lead a claim | I | None |
| E20.8 Other hypoparathyroidism | ||||
| E20.81 Hypoparathyroidism due to impaired parathyroid hormone secretion | ||||
| E20.810 | Autosomal dominant hypocalcemia | Can lead a claim | I | None |
| E20.811 | Secondary hypoparathyroidism in diseases classified elsewhereCMS: Secondary hypoparathyroidism in diseases classd elswhr | Cannot lead a claimManifestation code is not reportable as principal diagnosis | None | None |
| E20.812 | Autoimmune hypoparathyroidism | Can lead a claim, code first applies | I | None |
| E20.818 | Other specified hypoparathyroidism due to impaired parathyroid hormone secretionCMS: Oth hypoparathyroidism due to impaired PTH secretion | Can lead a claim | I | None |
| E20.819 | Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecifiedCMS: Hypoparathyroidism due to impaired PTH secretion, unsp | Can lead a claim | I | None |
| E20.89 | Other specified hypoparathyroidism | Can lead a claim | I | None |
| E20.9 | Hypoparathyroidism, unspecified | Can lead a claim | I | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue