Billing codes · ICD-10-CM code

E11 type 2 diabetes codes on nutrition claims

By Javier Alvarez · Updated September 29, 2026 · 5 min read

Type 2 diabetes is the diagnosis behind more MNT referrals than any other. It's also the one diagnosis that works with every payer, Medicare included. That makes it tempting to use E11.9 on everything. The code set, and many payers, expect more specificity when the chart supports it.

E11 codes dietitians see most

These are only the codes that show up most often on nutrition claims. E11 has dozens of combination codes for eye, kidney, nerve, circulatory, skin and oral complications. Codes like E11, E11.2, E11.6 and E11.64 are headers and will reject if billed.

Choosing the most specific code

The Official Guidelines (Section I.C.4.a) treat diabetes codes as combination codes: one code captures the type, the body system affected and the complication. Assign as many E11 codes as needed to describe all the documented complications, and sequence them by the reason for the visit.

Rules that come up in nutrition practice:

• Type not documented → E11. If the record doesn't state the type, the default is type 2. The same applies when it only says the patient uses insulin.
• "Poorly controlled" means hyperglycemia. The ICD-10-CM index sends "poorly controlled," "out of control" and "inadequately controlled" to "diabetes, by type, with hyperglycemia," which is E11.65 for type 2.
• The "with" convention links diabetes and CKD. When both are documented, the classification presumes a causal link, so it's E11.22 plus the N18 stage code (E11.22 says to use an additional code for the stage), unless the provider says they're unrelated. See N18 CKD codes.
• Remission is the provider's word. E11.A needs documented remission. The guidelines say "resolved" doesn't mean remission. If it's unclear, query the provider.
• You code from the record. An A1c of 9.8 in your note doesn't let you change E11.9 to E11.65. Ask the referring office to update the diagnosis if the chart doesn't match the patient's condition.

Add the medication code

The E11 category tells you to add a Z79 code for how the diabetes is controlled:

These codes don't change coverage, but they tell the payer why the nutrition plan looks the way it does, and they back up the medical necessity of frequent follow-ups. GLP-1 nutrition billing covers those visits in more detail.

Coverage for MNT with a diabetes diagnosis

Medicare. Part B covers MNT for beneficiaries with diabetes (NCD 180.1; 42 CFR 410.130-410.134):

• A physician (MD/DO) referral is required, documented in the medical record. Put the referring physician's NPI on the claim.
• 3 hours in the first year of MNT and 2 hours each year after. More hours are covered after a new referral for a change in diagnosis, medical condition or treatment regimen, billed with G0270/G0271.
• MNT and DSMT are both covered, but not on the same date of service.

The full walk-through is in the Medicare MNT billing guide.

Commercial. Most commercial plans cover MNT for diabetes under the medical benefit. Aetna's CPB 0049, for example, lists diabetes among the chronic conditions where nutritional counseling is medically necessary. Visit limits, referral rules and cost-share vary by plan. UnitedHealthcare's preventive policy even includes diabetes codes among the cardiovascular-risk diagnoses in its counseling row, so some diabetes claims process as preventive and others as medical. Check the EOB and verify the member's benefit rather than assuming.

Pairing with CPT codes and secondary codes

All the patients in these examples are made up. Point each service line at the diabetes code, not at a Z code.

What the note must show

• The diabetes diagnosis, with type and any complications, traced to the referral or chart.
• For Medicare: the referral from the treating physician, and a record of hours used this year.
• Your assessment (labs and meds as reported), the PES statement, the intervention and goals.
• Start and end time, or total time face to face, to support the units.

Denials and fixes

More in why nutrition claims get denied and the MNT codes reference.

Prediabetes before a diabetes diagnosis is coded differently. See R73.03, and the full ICD-10 codes for dietitians reference.