E03.9 — Hypothyroidism, unspecified
Is E03.9 billable?
Yes, but E03.9 is an unspecified code. E03.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, E03.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting E03.9 — the more specific alternatives are listed below.
E03.9 at a glance
| Code | E03.9 |
|---|---|
| Description | Hypothyroidism, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does E03.9 group to?
E03.9 sits in MDC 10 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 643Endocrine Disorders with MCCmedical
- 644Endocrine Disorders with CCmedical
- 645Endocrine Disorders without CC/MCCmedical
How is E03.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to E03.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hoffmann's syndrome
- Hypothyroidism (acquired)
- Myxedema (adult) (idiocy) (infantile) (juvenile)
- Cataract › myxedema (cortical) (immature) (incipient)
- Insufficiency, insufficient › thyroid
- Anemia › due to › myxedema (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound)
- Arthritis, arthritic › in › hypothyroidism NEC (acute) (chronic) (nonpyogenic) (subacute)
- Arthropathy › in › hypothyroidism
- Dementia › in › hypothyroidism, acquired (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
- Myopathy › in › hypothyroidism
- Myopathy › in › myxedema
- Ataxia, ataxy, ataxic › cerebellar › in › myxedema
Inclusion terms
Alternative wording in documentation that is classified to E03.9.
- Myxedema NOS
Excludes1 — never code together — inherited from Chapter 4
The conditions below can never be reported together with E03.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Excludes1 — never code together — inherited from E03
The conditions below can never be reported together with E03.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
How long has E03.9 existed?
E03.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with E03.9?
ICD-10-CM declares these codes mutually exclusive with E03.9 — exactly one of each pair can be correct for a given encounter.