E66.01: Morbid (severe) obesity due to excess calories

E66.01, morbid (severe) obesity due to excess calories, is listed as a covered diagnosis in 3 Medicare billing and coding articles that apply to 9 HCPCS Level II codes, including G0017 (Psychotherapy for crisis furnished in an applicable site…), G0018 (Psychotherapy for crisis furnished in an applicable site…), C8925 (Transesophageal echocardiography (tee) with contrast, or…). The articles come from 3 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.

HCPCS Level II codes with E66.01 as a covered diagnosis

Code	Description	Medicare coverage	DMEPOS fee 2026 (state range)	Articles listing it
G0017	Psychotherapy for crisis furnished in an applicable site of service (any place of service at which the non-facility rate for psychotherapy for crisis services applies, other than the office setting); first 60 minutes	Carrier judgment	—	2
G0018	Psychotherapy for crisis furnished in an applicable site of service (any place of service at which the non-facility rate for psychotherapy for crisis services applies, other than the office setting); each additional 30 minutes (list separately in addition to code for primary service)	Carrier judgment	—	2
C8925	Transesophageal echocardiography (tee) with contrast, or without contrast followed by with contrast, real time with image documentation (2d) (with or without m-mode recording); including probe placement, image acquisition, interpretation and report	Special coverage instructions apply	—	1
C8926	Transesophageal echocardiography (tee) with contrast, or without contrast followed by with contrast, for congenital cardiac anomalies; including probe placement, image acquisition, interpretation and report	Special coverage instructions apply	—	1
C8927	Transesophageal echocardiography (tee) with contrast, or without contrast followed by with contrast, for monitoring purposes, including probe placement, real time 2-dimensional image acquisition and interpretation leading to ongoing (continuous) assessment of (dynamically changing) cardiac pumping function and to therapeutic measures on an immediate time basis	Special coverage instructions apply	—	1
G0410	Group psychotherapy other than of a multiple-family group, in a partial hospitalization or intensive outpatient setting, approximately 45 to 50 minutes	Carrier judgment	—	1
G0411	Interactive group psychotherapy, in a partial hospitalization or intensive outpatient setting, approximately 45 to 50 minutes	Carrier judgment	—	1
G0451	Development testing, with interpretation and report, per standardized instrument form	Carrier judgment	—	1
G0560	Safety planning interventions, each 20 minutes personally performed by the billing practitioner, including assisting the patient in the identification of the following personalized elements of a safety plan: recognizing warning signs of an impending suicidal or substance use-related crisis; employing internal coping strategies; utilizing social contacts and social settings as a means of distraction from suicidal thoughts or risky substance use; utilizing family members, significant others, caregivers, and/or friends to help resolve the crisis; contacting mental health or substance use disorder professionals or agencies; and making the environment safe	Carrier judgment	—	1

Medicare policy articles listing E66.01

A57179: Billing and Coding: Transesophageal Echocardiogram (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B); 3 Level II codes). LCD with the same title: L33756
A57480: Billing and Coding: Psychiatry and Psychology Services (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 4 Level II codes). LCD with the same title: L33632, L34616
A57130: Billing and Coding: Psychiatric Codes (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 4 Level II codes). LCD with the same title: L35101

A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.

Other E66 diagnoses (Overweight and obesity)

E66.2 — Morbid (severe) obesity with alveolar hypoventilation

Frequently asked questions

Does Medicare cover E66.01 (Morbid (severe) obesity due to excess calories)?

Medicare covers items and services, not diagnoses. 3 Medicare billing and coding articles list E66.01 as a covered diagnosis for 9 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.

Which HCPCS codes can be billed with ICD-10 E66.01?

The Level II codes from the policies most specific to this diagnosis are G0017 (Psychotherapy for crisis furnished in an applicable site…, 2 articles); G0018 (Psychotherapy for crisis furnished in an applicable site…, 2 articles); C8925 (Transesophageal echocardiography (tee) with contrast, or…, 1 article); C8926 (Transesophageal echocardiography (tee) with contrast, or…, 1 article); C8927 (Transesophageal echocardiography (tee) with contrast, or…, 1 article). Code choice depends on the item supplied; check each code's descriptor.

Which Medicare policy articles list E66.01?

A57179 (Billing and Coding: Transesophageal Echocardiogram); A57480 (Billing and Coding: Psychiatry and Psychology Services); A57130 (Billing and Coding: Psychiatric Codes).

What is ICD-10-CM code E66.01?

E66.01 is the ICD-10-CM code for morbid (severe) obesity due to excess calories, in category E66 (Overweight and obesity), chapter 4: Endocrine, nutritional and metabolic diseases.

Next steps

Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.

Chapter 4: Endocrine, nutritional and metabolic diseases · All diagnoses · HCPCS lookup