ICD-10-CM 2027 diagnosis code
E03.9Hypothyroidism, unspecified
E03.9 is a valid, billable ICD-10-CM code for hypothyroidism, unspecified. 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 Hypothyroidism, ICD-10 code for Myxedema, ICD-10 code for Hoffmann's syndrome.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About E03.9
E03.9 is the ICD-10-CM diagnosis code for hypothyroidism, unspecified. It belongs to category E03 (other hypothyroidism), block E00-E07 (disorders of thyroid gland) 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 E03, choose E03.9 (Hypothyroidism, unspecified) only when documentation doesn't support a more specific option: congenital hypothyroidism with diffuse goiter (E03.0), congenital hypothyroidism without goiter (E03.1), hypothyroidism due to medicaments and other exogenous substances (E03.2), postinfectious hypothyroidism (E03.3), atrophy of thyroid (acquired) (E03.4), myxedema coma (E03.5) and other specified hypothyroidism (E03.8).
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) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 244.9 (unspecified acquired hypothyroidism).
Coding notes
- Myxedema NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to E03.9.
› From E03 Other hypothyroidism
Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.
Alphabetic index entries
15 entriesTerms in the official ICD-10-CM index that lead to E03.9.
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound) › due to (in) (with) › myxedema
- Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › hypothyroidism NEC
- Arthropathy › in (due to) › hypothyroidism
- Ataxia, ataxy, ataxic › cerebellar (hereditary) › in › myxedema
- Atrophy, atrophic (of) › systemic affecting central nervous system › in › myxedema
- Cataract (cortical) (immature) (incipient) › myxedema
- Degeneration, degenerative › brain (cortical) (progressive) › in › myxedema
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › hypothyroidism, acquired
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › hypothyroidism, acquired › with behavioral disturbance
- Hoffmann's syndrome
- Hypothyroidism (acquired)
- Insufficiency, insufficient › thyroid (gland) (acquired)
- Myopathy › in (due to) › hypothyroidism
- Myopathy › in (due to) › myxedema
- Myxedema (adult) (idiocy) (infantile) (juvenile)
Codes whose notes reference E03.9
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 10 · Endocrine, Nutritional and Metabolic Diseases and Disorders
ICD-9-CM equivalent
Converter →- 244.9Unspecified acquired hypothyroidismexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about E03.9
Is E03.9 billable?
- Yes. E03.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E03.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E03.9 as a principal diagnosis.
Is E03.9 a CC or MCC?
- No. E03.9 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does E03.9 group to?
- E03.9 is used in the MS-DRG v44.0 logic for MS-DRG 643 (Endocrine Disorders with MCC), MS-DRG 644 (Endocrine Disorders with CC) and MS-DRG 645 (Endocrine Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for E03.9?
- The CMS General Equivalence Mappings map E03.9 to ICD-9-CM 244.9.