Reviewed July 1, 2026

ICD-10 codes for obesity

Obesity coding requires both the clinical diagnosis and, when documented, the BMI category. E66.- codes describe obesity; Z68.- codes describe body mass index and are commonly added when BMI is recorded.

E66.9 billable

Obesity ICD-10 codes

Start with the primary code, then move to a more specific related code when the documentation supports it.

E66.9

Obesity, unspecified

ICD-10-CM

E66.01

Morbid (severe) obesity due to excess calories

ICD-10-CM

E66.3

Overweight

ICD-10-CM

Z68.30

Body mass index 30.0-30.9, adult

ICD-10-CM

Z68.41

Body mass index 40.0-44.9, adult

ICD-10-CM

Z71.3

Dietary counseling and surveillance

ICD-10-CM

Code the documented weight diagnosis first: overweight, obesity, or severe obesity. Add the specific BMI Z68.- code when BMI is documented and payer rules allow it. Do not code BMI alone without the associated clinical diagnosis.

Weight-management visit. BMI 42.1 with hypertension and knee pain limiting exercise. Assessment: severe obesity due to excess calories. Discussed nutrition plan, GLP-1 eligibility, and referral to dietitian.

E66.01
Z68.41
Z71.3

Paste a note or record audio. Notat’s FactsContext™ engine extracts the raw clinical facts first, then suggests codes from that context so you can inspect the evidence before using anything.

Exemples

Note clinique

Modifiez l'exemple ou collez votre propre note.

Système de codage

ICD-10-CM

Codes extraits

Les preuves restent attachées pour examen.

Codes

3

I10

ICD-10-CM

Essential (primary) hypertension

Preuve: “Chief Complaint Elevated and fluctuating blood pressure readings.

E78.5

ICD-10-CM

Hyperlipidemia, unspecified

Preuve: “2. Hyperlipidemia. Clinically stable on atorvastatin.

M19.90

ICD-10-CM

Unspecified osteoarthritis, unspecified site

Preuve: “3. Osteoarthritis. Symptoms stable. Continue conservative management with acetaminophen as needed.

FactsContext extracts clinical facts first: diagnoses, symptoms, negatives, findings, test results, medications, and plan decisions.

The clinician can read and reuse the extracted medical context directly, independent of the generated note.

AI suggestions are not a substitute for clinician judgment, payer rules, local coding policy, or the official code set.

FAQ

Can I code BMI without obesity?

BMI Z68.- codes are secondary context codes and generally require the associated weight diagnosis to be documented.

When is E66.01 appropriate?

Use E66.01 when severe or morbid obesity due to excess calories is documented, often with BMI 40 or higher depending on clinical and payer context.

Can AI extract BMI and counseling facts?

Notat extracts BMI, obesity diagnosis, comorbidities, and counseling decisions as clinical facts, then suggests diagnosis and BMI codes with supporting evidence.