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ICD-10-CM 2027 diagnosis code

E20.810Autosomal dominant hypocalcemia

✓ Billable / specific

E20.810 is a valid, billable ICD-10-CM code for autosomal dominant hypocalcemia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Autosomal dominant hypocalcemia.

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E20.810

E20.810 is the ICD-10-CM diagnosis code for autosomal dominant hypocalcemia. It belongs to category E20 (hypoparathyroidism), block E20-E35 (disorders of other endocrine glands) and chapter 4 (endocrine, nutritional and metabolic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within E20.81 (hypoparathyroidism due to impaired parathyroid hormone secretion), E20.810 is specifically for autosomal dominant hypocalcemia. Related codes cover secondary hypoparathyroidism in diseases classified elsewhere (E20.811), autoimmune hypoparathyroidism (E20.812), other specified hypoparathyroidism due to impaired parathyroid hormone secretion (E20.818) and unspecified (E20.819).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044), DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2024, effective October 1, 2023.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Autosomal dominant hypocalcemia type 1 (ADH1)
  • Autosomal dominant hypocalcemia type 2 (ADH2)
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • , if applicable, any associated conditions, such as:
  • calculus of kidney (N20.0)
  • chronic kidney disease (N18.-)
  • respiratory distress (J80, R06.-)
  • seizure disorder (G40.-, R56.9)

Notes that apply from higher levels

Instructions written at a parent level also apply to E20.810.

› From E20 Hypoparathyroidism
Excludes1
  • Di George's syndrome (D82.1)
  • postprocedural hypoparathyroidism (E89.2)
  • tetany NOS (R29.0)
  • transitory neonatal hypoparathyroidism (P71.4)

Broader instructions also apply from E20-E35 Disorders of other endocrine glands and Chapter 4: Endocrine, nutritional and metabolic diseases.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to E20.810.

Codes whose notes reference E20.810

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about E20.810

Is E20.810 billable?

Yes. E20.810 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can E20.810 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict E20.810 as a principal diagnosis.

Is E20.810 a CC or MCC?

No. E20.810 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does E20.810 group to?

E20.810 is used in the MS-DRG v44.0 logic for MS-DRG 643 (Endocrine Disorders with MCC), MS-DRG 644 (Endocrine Disorders with CC), MS-DRG 645 (Endocrine Disorders without CC/MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.