ICD-10 · PDGM grouping
E66 Overweight and obesity
All 10 codes in the E66 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
10
Can lead a claim
10
Cannot lead a claim
0
What CMS assigns to E66
All 10 codes group to MMTA - Other. 1 of the 10 counts toward the Obesity, and Disorders of Metabolism and Fluid Balance comorbidity subgroup; 9 are assigned none. Every code can lead a claim. CMS attaches a code-first note to all 10.
- Obesity, and Disorders of Metabolism and Fluid Balance: counts toward the high comorbidity tier only in an interaction pair.
Code first
CMS grouper convention 23, on all 10 codes. Code first:
- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Every code in E66
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| E66.0 Obesity due to excess calories | ||||
| E66.01 | Morbid (severe) obesity due to excess calories | Can lead a claim, code first applies | A | Obesity, and Disorders of Metabolism and Fluid Balance |
| E66.09 | Other obesity due to excess calories | Can lead a claim, code first applies | A | None |
| E66.1 | Drug-induced obesity | Can lead a claim, code first applies | A | None |
| E66.2 | Morbid (severe) obesity with alveolar hypoventilation | Can lead a claim, code first applies | A | None |
| E66.3 | Overweight | Can lead a claim, code first applies | A | None |
| E66.8 Other obesity | ||||
| E66.81 Obesity class | ||||
| E66.811 | Obesity, class 1 | Can lead a claim, code first applies | A | None |
| E66.812 | Obesity, class 2 | Can lead a claim, code first applies | A | None |
| E66.813 | Obesity, class 3 | Can lead a claim, code first applies | A | None |
| E66.89 | Other obesity not elsewhere classified | Can lead a claim, code first applies | A | None |
| E66.9 | Obesity, unspecified | Can lead a claim, code first applies | A | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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