DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

E03.9 diagnosis code · Billable code · FY2027

E03.9 Hypothyroidism, unspecified

  • Billable
  • Not CC/MCC
  • POA reported

E03.9 ICD-10 code: a billable diagnosis code in FY2027, one of 8 billable codes in category E03.

Where it sits

  1. Chapter 4 Endocrine, nutritional and metabolic diseases (E00-E89)
  2. E00-E07 Disorders of thyroid gland (E00-E07)
  3. E03 Other hypothyroidism
  4. E03.9 Hypothyroidism, unspecified
CC / MCC
Neither
MS-DRG
643-645
HCC V28
–
POA
Reported
Code Editor
–
Index entries
15

Instructions

At E03.9

Inclusion terms

  • Myxedema NOS

Notes that also apply

Excludes1 from E03

  • iodine-deficiency related hypothyroidism (E00-E02) E00 E02
  • postprocedural hypothyroidism (E89.0) E89.0

Chapter 4 instructions (Notes 1, Excludes1 1): printed on the chapter 4 page.

Index entries

  • Hoffmann's syndrome → E03.9 [G73.7]
  • Hypothyroidism (acquired) → E03.9
  • Myxedema (adult) (idiocy) (infantile) (juvenile) → E03.9
  • Cataract (cortical) (immature) (incipient)myxedema → E03.9 [H28]
  • Insufficiency, insufficientthyroid (gland) (acquired) → E03.9
  • Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound)due to (in) (with)myxedema → E03.9 [D63.8]
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)in (due to)hypothyroidism NEC → E03.9
  • Arthropathyin (due to)hypothyroidism → E03.9 [M14.8-]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)in (due to)hypothyroidism, acquired → E03.9 [F02.80]
  • Myopathyin (due to)hypothyroidism → E03.9 [G73.7]
  • Myopathyin (due to)myxedema → E03.9 [G73.7]
  • Ataxia, ataxy, ataxiccerebellar (hereditary)inmyxedema → E03.9 [G13.2]
  • Atrophy, atrophic (of)systemic affecting central nervous systeminmyxedema → E03.9 [G13.2]
  • Degeneration, degenerativebrain (cortical) (progressive)inmyxedema → E03.9 [G32.89]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)in (due to)hypothyroidism, acquiredwith behavioral disturbance → E03.9 [F02.81-]

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for E03.9
CC / MCCNeither
Appendix BMDC 10 Endocrine, Nutritional and Metabolic Diseases and Disorders, MS-DRG 643-645 (Endocrine Disorders with MCC…)
Code Editor–
POAReported
HCC V28–

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy