E66.89 — Other obesity not elsewhere classified
Is E66.89 billable?
Yes, but E66.89 is an unspecified code. E66.89 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, E66.89 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 E66.89 — the more specific alternatives are listed below.
More specific alternatives
E66.89 at a glance
| Code | E66.89 |
|---|---|
| Description | Other obesity not elsewhere classified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to E66.89?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name E66.89 directly.
CMS does not consider this code, on its own, sufficient justification for admission to an acute care hospital when reported as the principal diagnosis.
Which MS-DRGs does E66.89 group to?
E66.89 sits in MDC 10 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 640Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCCmedical
- 641Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCCmedical
How is E66.89 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to E66.89. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Obesity › constitutional
- Obesity › endocrine
- Obesity › endogenous
- Obesity › familial
- Obesity › glandular
- Obesity › specified type NEC
Excludes1 — never code together — inherited from Chapter 4
The conditions below can never be reported together with E66.89 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)
Code first — inherited from E66
The underlying condition below must be sequenced before E66.89. E66.89 describes a manifestation and cannot be the principal or first-listed diagnosis.
- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use additional code — inherited from E66
Report an additional code alongside E66.89 to fully describe the condition. E66.89 is sequenced first.
Excludes2 — not included here — inherited from E66
The conditions below are not part of E66.89, but a patient may have both at the same time. When documentation supports it, E66.89 and the excluded code may both be reported.
How long has E66.89 existed?
E66.89 first appears in FY2025.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.