Is ICD-10 E11.9 billable?

Yes. E11.9 is a billable ICD-10-CM code with sufficient specificity for claim submission. Always confirm against current CMS Local Coverage Determinations (LCDs) and the patient documentation supports the diagnosis.

What are common denial reasons for E11.9?

The most common denial categories for diagnosis-related issues are CO-16 (information missing or incorrect, often documentation specificity), CO-50 (medical necessity, often a mismatch between diagnosis and procedure), and CO-11 (the diagnosis is inconsistent with the procedure). Specific denial behavior varies by payer and plan.

Who can I get help from on E11.9 billing?

For specialty-specific coding questions on this code, AAPC- and AHIMA-credentialed coders on the Medonix team handle production billing for U.S. healthcare practices. Book a discovery call at /audit/ to talk through your specialty and payer mix.

ICD-10-CM · Endocrine, nutritional, metabolic

E11.9: Type 2 diabetes mellitus without complications

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E11.9 is the ICD-10-CM code for Type 2 diabetes mellitus without complications. Billable on U.S. claims with supporting documentation. Chapter: Endocrine, nutritional, metabolic. Category: E11.

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E11.9Type 2 diabetes mellitus without complications

Chapter: Endocrine, nutritional, metabolicCategory: E11Billable

About this code

Type 2 diabetes mellitus without complications.

E11.9 is an ICD-10-CM diagnosis code for type 2 diabetes mellitus without complications. It sits in the 4. Endocrine, nutritional, metabolic chapter of the U.S. clinical modification, under category E11.

This code is billable on U.S. healthcare claims when supported by appropriate clinical documentation. The patient chart must establish the diagnosis, capture any clinical detail encoded in the code (severity, laterality, encounter type, complications where applicable), and demonstrate medical necessity for the billed services.

Payer-specific coverage rules vary. Always cross-check against the current Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) for the payer adjudicating the claim, plus any specialty-specific CMS Medicare Administrative Contractor guidance.

Billing context

What practitioners watch for on E11.9.

Code-specific billing guidance for E11.9, written from production billing experience.

Documentation

Document type 2 diabetes without complications. If any complication is mentioned in the chart (neuropathy, nephropathy, retinopathy, peripheral angiopathy), use the appropriate combination code under E11 instead. Long-term insulin use requires Z79.4 as additional code.

Common denial categories

CO-16: Information missing or incorrect, often documentation of complications. If complications are documented, use the specific E11.x combination code rather than E11.9.
CO-50: Service not deemed medically necessary (often DM education without G-code). Pair with G0108 (DSME individual) or G0109 (group) for diabetes education encounters.

Coverage signal

Endocrine coverage is generally broad. Type 2 diabetes (E11) codes follow the "with" convention: a manifestation listed under the parent E11 code is presumed related unless documented otherwise.

Common specialties

Endocrinology · Family Medicine · Internal Medicine

Companion CPT codes

Procedures commonly billed alongside E11.9 based on Medonix client production data and CMS coding guidance.

5 codes

83036Hemoglobin A1c
80061Lipid panel
99213Office visit, established, low complexity
99214Office visit, established, moderate complexity
G0108Diabetes self-management training, individual

CPT is a registered trademark of the American Medical Association. Codes shown for educational reference only.

Related codes

Other codes in category E11.

Search all codes

Sources

Where this entry comes from.

NLM Clinical Tables Search Service: the official U.S. National Library of Medicine API for ICD-10-CM lookup.
CDC National Center for Health Statistics: annual ICD-10-CM Tabular List release with effective date October 1.
CMS Medicare Coverage Database: Local Coverage Determinations and National Coverage Determinations for payer-specific rules.

Frequently asked

About ICD-10 code E11.9.

E11.9 is the ICD-10-CM code for Type 2 diabetes mellitus without complications. It belongs to the Endocrine, nutritional, metabolic chapter and the E11 category. It is a billable leaf code, meaning it is specific enough to use on a claim.

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