ICD-10-CM Alphabetic Index · FY 2026 44 Entries
Obesity in the ICD-10-CM Index ICD-10-CM
The main term Obesity carries 44 index entries pointing to 16 ICD-10-CM codes. The default entry is E66.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
44
Index Entries
16
Codes Referenced
E66.9
Default Code
O
Letter
44 of 44 shown
ICD-10-CM
Index Entries Under Obesity 44 entries · 16 codes
Obesity E66.9
with alveolar hypoventilation E66.2
adrenal E27.8
class
1 E66.811
2 E66.812
3 E66.813
complicating
childbirth O99.214
pregnancy O99.21- Non-billable
puerperium O99.215
constitutional E66.89
dietary counseling and surveillance Z71.3
drug-induced E66.1
due to
disruption of MC4R pathway E88.82
drug E66.1
excess calories E66.09
morbid E66.01
severe E66.01
gene mutation
leptin (LEP) E88.82
leptin receptor (LEPR) E88.82
melanocortin 4 Receptor (MC4R) E88.82
nuclear receptor coactivator 1 (NCOA1) E88.82
proopiomelanocortin (POMC) E88.82
proprotein convertase subtilisin/kexin type 1 (PCSK1) E88.82
src homology 2B adaptor signaling protein (SH2B1) E88.82
endocrine E66.89
endogenous E66.89
exogenous E66.09
familial E66.89
glandular E66.89
hypothyroid see Hypothyroidism
hypoventilation syndrome (OHS) E66.2
morbid E66.01
with
alveolar hypoventilation E66.2
obesity hypoventilation syndrome (OHS) E66.2
due to excess calories E66.01
nutritional E66.09
pituitary E23.6
severe E66.01
specified type NEC E66.89
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
