DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

E03 Other hypothyroidism

  • Header · not billable

E03 is not billable. The category heads 8 billable codes in FY2027: the 8 codes directly below it.

ICD-10 code by name

What is the ICD-10 code for hypothyroidism, unspecified?
Hypothyroidism ICD-10 code: E03.9 Hypothyroidism, unspecified. Search ICD-10 for hypothyroidism

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
Billable codes
8
Subdivisions
8
CC / MCC codes
0 / 1
HCC V28 codes
1
New FY2027
0
Index entries
31

Codes in E03

  1. E03.0
    Congenital hypothyroidism with diffuse goiter
    Billable
    Inclusion terms 2, Excludes1 1

    Inclusion terms

    • Congenital parenchymatous goiter (nontoxic)
    • Congenital goiter (nontoxic) NOS

    Excludes1

    • transitory congenital goiter with normal function (P72.0) P72.0
  2. E03.1
    Congenital hypothyroidism without goiter
    Billable
    Inclusion terms 3

    Inclusion terms

    • Aplasia of thyroid (with myxedema)
    • Congenital atrophy of thyroid
    • Congenital hypothyroidism NOS
  3. E03.2
    Hypothyroidism due to medicaments and other exogenous substances
    Billable
    Code first 1, Use additional code 1

    Code first

    • poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4) T36 T65

    Use additional code

    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) T36 T50
  4. E03.3
    Postinfectious hypothyroidism
    Billable
  5. E03.4
    Atrophy of thyroid (acquired)
    Billable
    Excludes1 1

    Excludes1

    • congenital atrophy of thyroid (E03.1) E03.1
  6. E03.5
    Myxedema coma
    BillableMCC202
  7. E03.8
    Other specified hypothyroidism
    Billable
  8. E03.9
    Hypothyroidism, unspecified 1 billable code
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At E03

Excludes1

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

Notes that also apply

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

Index entries

  • Gull's disease → E03.4
  • Strumipriva cachexia → E03.4
  • Goiter (plunging) (substernal)congenital (nontoxic) → E03.0
  • Agenesisthyroid (gland) → E03.1
  • Aplasiathyroid (congenital) (with myxedema) → E03.1
  • Athyrea (acquired)congenital → E03.1
  • Hypoplasia, hypoplasticthyroid (gland) → E03.1
  • Hypothyroidism (acquired)congenital (without goiter) → E03.1
  • Subthyroidism (acquired)congenital → E03.1
  • Hypothyroidism (acquired)iatrogenic NEC → E03.2
  • Hypothyroidism (acquired)postinfectious → E03.3
  • Atrophy, atrophic (of)thyroid (gland) (acquired) → E03.4
  • Cachexiastrumipriva → E03.4
  • Comamyxedematous → E03.5
  • Myxedema (adult) (idiocy) (infantile) (juvenile)coma → E03.5
  • Hypothyroidism (acquired)specified NEC → E03.8
  • Goiter (plunging) (substernal)congenital (nontoxic)diffuse → E03.0
  • Goiter (plunging) (substernal)congenital (nontoxic)parenchymatous → E03.0
  • Hypothyroidism (acquired)congenital (without goiter)with goiter (diffuse) → E03.0
  • Absence (of) (organ or part) (complete or partial)thyroid (gland) (acquired)congenital → E03.1
  • Atrophy, atrophic (of)thyroid (gland) (acquired)with cretinism → E03.1
  • Atrophy, atrophic (of)thyroid (gland) (acquired)congenital (with myxedema) → E03.1
  • Insufficiency, insufficientthyroid (gland) (acquired)congenital → E03.1
  • Hypothyroidism (acquired)due toexogenous substance NEC → E03.2
  • Hypothyroidism (acquired)due tomedicament NEC → E03.2
  • Hypothyroidism (acquired)due toP-aminosalicylic acid (PAS) → E03.2
  • Hypothyroidism (acquired)due tophenylbutazone → E03.2
  • Hypothyroidism (acquired)due toresorcinol → E03.2
  • Hypothyroidism (acquired)due tosulfonamide → E03.2
  • Hypothyroidism (acquired)due tothiourea group drugs → E03.2
  • Jaundice (yellow)newborndue to or associated withhypothyroidism, congenital → E03.1

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