E66.9

Obesity, unspecified

Billable / specific

E66.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Applicable to

  • Obesity NOS

Includes (from E66)

  • Note: All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

Excludes1

Not coded here — never report together with this code.

  • transitory endocrine and metabolic disorders specific to newborn (P70-P74) (from E66)

Excludes2

Not included here — may be reported together when both conditions exist.

  • adiposogenital dystrophy (E23.6) (from E66)
  • lipomatosis dolorosa [Dercum] (E88.2) (from E66)
  • lipomatosis NOS (E88.2) (from E66)
  • Prader-Willi syndrome (Q87.11) (from E66)

Code first

Sequence the underlying condition first.

  • obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-) (from E66)

Use additional code

Add a code to identify the following, if applicable.

  • code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-) (from E66)

Also known as

  • Obesity NOS
  • Obesity

Parent code

  • E66Overweight and obesityHeader

Related codes

  • E66.0Obesity due to excess caloriesHeader
  • E66.1Drug-induced obesityBillable
  • E66.2Morbid (severe) obesity with alveolar hypoventilationBillable
  • E66.3OverweightBillable
  • E66.8Other obesityHeader

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