What Goes on a Dietitian Superbill in the US: The Payers Disagree

What must a dietitian superbill include?

Whatever the client’s insurer requires on a member-submitted claim, which no federal rule fixes. Medicare’s regulations prescribe two forms: the CMS-1500 “for use by physicians and other suppliers to request payment”, and the CMS-1490S “for use by a patient to request payment for medical expenses”. The NUCC manual that defines every CMS-1500 field states on its first page that it “is intended to be a guide … and not definitive instructions”, and that users “should refer to the most current federal, state, or other payer instructions”. A superbill is therefore built to a payer’s list, using the form’s vocabulary. Issuing a superbill rather than filing the claim is also what keeps a cash-pay practice outside HIPAA: see whether HIPAA applies to a private-practice dietitian.

Fourteen items are genuine form fields on the CMS-1500 and can be treated as the default set. The billing provider’s name and street address share one box with the phone number, and the billing NPI has its own. The form defines the federal tax ID as the number “intended to be used for 1099 reporting purposes”, an EIN or Social Security number with a box to say which: see whether that tax ID is your SSN or an EIN. The client’s name, date of birth and date of service are fields. The place-of-service code comes from the CMS code set, and the CPT or HCPCS code, with any modifier, is shown “without a narrative description”. Up to twelve ICD-10-CM codes go in without decimal points. The money fields are the per-line charge, the total charge and the amount paid, where “Amount Paid” is what “the patient and/or other payers paid”. The last is a signature, for which “Signature on File” is expressly acceptable. A referring provider’s name and NPI are fields too, relevant wherever a plan conditions nutrition counseling on a referral.

Four items that appear on most published templates are not form fields. A state license number has no dedicated field on the CMS-1500 and is reportable only as an "Other ID" behind qualifier 0B. It is a convention several payers and most state boards expect, not a form requirement. Session length in minutes appears on no US form and in no payer document reviewed. Duration is carried by the code's unit definition and the units column, and advice to write the length of the visit on the receipt is transplanted from Canadian carriers, two of which do ask for it. "Paid in full" is a yes-or-no question on some payer forms with proof attached separately, not a field on the bill. And a diagnosis narrative is prohibited next to the procedure code.

Why do insurers disagree about what goes on the bill?

Because each writes its own member-claim instructions and none of them copies the CMS-1500. Medicare's own list, on Form CMS-1490S, asks for the date and place of service, a description of the illness, a description of each service, the charge for each, the provider's name and address, and the NPI "if known", with no tax ID anywhere. Premera Blue Cross asks for the member's name, the provider's "name, address, and IRS tax identification number", an ICD-10 diagnosis code, procedure codes, and the date and itemized charge for each service, warns that the claim "will be returned if all of the required information listed above is not included", and asks for no NPI and no license number. Aetna's member form asks for the patient's name, the condition being treated, the type of service, the dates and the relationship to the employee, with receipts as proof of payment, and tells the member that if anything is missing they may "write it on the bill and sign your name".

Aetna's form also contains the closest thing the US has to a provider-completed claim form: a "to be completed by physician or supplier" section whose items are diagnosis, procedure code, description, date and place of service, charges, days or units, provider name, address and phone, the taxpayer number for 1099 reporting, total charge, amount paid and balance due, signature, NPI and date. A dietitian can complete that section instead of issuing a separate superbill, and its field list is effectively the superbill specification for that payer.

A template built to the largest list is over-built for Aetna and Medicare, and one built to Medicare's list is returned by Premera for lacking a tax ID. The workable approach is a bill that carries every CMS-1500 form field plus the license number by convention, which satisfies all three, and a practice policy of checking the client's own carrier form the first time a new plan appears.

The same finding holds in Canada, where Sun Life, Canada Life, Manulife and Alberta Blue Cross each ask for different fields. See what goes on a dietitian receipt in Canada.

Which place-of-service code and modifier does a telehealth session use?

Place-of-service code 10 for a video session with the client at home, 02 for telehealth with the client somewhere other than home, and 11 for an in-person session in the practice's own office. POS 10 has been available to Medicare since April 1, 2022. The codes come from the CMS place-of-service set and are not invented per practice.

Medicare identifies a telehealth claim by the place-of-service code alone: "by billing place of service code 02 or 10 with a covered telehealth procedure code, the distant site physician/practitioner certifies that the beneficiary was present at an eligible originating site". Modifier 95 is not a Medicare requirement, and modifier GT survives only for critical access hospitals. UnitedHealthcare states that "modifiers 95, GT, GQ and G0 are not required to identify Telehealth services but are accepted as informational", and identifies an audio-only session with modifier 93 and the same place-of-service codes. Other commercial payers' telehealth policies were not reviewed for this page, so a superbill that carries modifier 95 should carry it because the client's specific plan asks for it, not as a general rule.

Minutes do not go on the bill. Each nutrition-therapy code is defined in units, 15 minutes for the individual codes and 30 for the group codes, and the count goes in the units column. A 45-minute individual follow-up is three units of 97803.

Which diagnosis codes go on a nutrition superbill?

Only codes that a provider has documented, and for a dietitian that distinction is written into the coding guidelines. The ICD-10-CM Official Guidelines state that "a dietitian often documents the BMI", but that "the associated diagnosis (such as overweight, obesity …) must be documented by the patient's provider". BMI codes "should only be assigned when there is an associated, reportable diagnosis", never alone, and never during pregnancy. A superbill that carries an obesity or diabetes code the client's physician has not documented is asserting a diagnosis the dietitian did not make.

Z71.3, "dietary counseling and surveillance", is a complete billable code with valid-code flag 1 in the FY2026 file. It is not subdivided in any code file this page checked: Z71.31 and Z71.32 do not exist in the FY2024, FY2025, FY2026 or FY2027 files, whatever the billing blogs say. The tabular list directs the coder from Z71.3 to a BMI code "if known" and to any underlying condition. The adult BMI codes run from Z68.1 to Z68.45 until September 30, 2026. On October 1, 2026, Z68.1 becomes a header and is replaced by Z68.18 for a BMI of 18.4 or less and Z68.19 for 18.5 to 19.9, so a superbill carrying Z68.1 alone after that date is a rejection risk. The pediatric severe-obesity codes Z68.55 and Z68.56 date from October 2024, and Aetna's nutrition bulletin, last reviewed in March 2026, still prints the title Z68.54 carried before October 1, 2024. Where a payer table and the CDC file disagree, the CDC file governs.

No federal rule makes any of these codes a condition of preventive coverage, and no payer policy reviewed names Z71.3. What the payer policies do gate on is the condition code: UnitedHealthcare pays the nutrition-therapy codes as preventive only with a listed overweight or obesity diagnosis or BMI code, and Aetna's bulletin lists BMI ranges as covered diagnoses. The two carriers disagree on the BMI floor, so no single statement of which codes payers accept is safe.

Which services a plan covers at all, and why the ACA’s no-cost preventive benefit rarely reaches an out-of-network dietitian, is set out in which US insurers cover dietitian services. The other decisions that change by state are mapped in starting a dietitian private practice in the US.

Can clients pay a dietitian with an HSA or FSA?

Yes, on one condition the IRS states in its own words: "only if the nutritional counseling treats a specific disease diagnosed by a physician (such as obesity or diabetes). Otherwise, the cost of nutritional counseling is not a medical expense." That answer is in the IRS's nutrition and wellness FAQ, not in Publication 502, which contains no entry for nutritional counseling at all. The diagnosing party is a physician in every relevant answer, and a dietitian's own nutrition diagnosis does not satisfy it. Publication 502 applies the same test to weight-loss programs, including group and meeting fees, and excludes gym dues, diet food, and any program "if the purpose of the weight loss is the improvement of appearance, general health, or sense of well-being".

"Letter of medical necessity" appears nowhere in Publication 502 or the FAQ. It is the plan-administrator practice that has grown up around the words "substantiated by a physician". What the FSA rules actually require, per IRS Chief Counsel Advice 202317020, is that every expense be "substantiated by information from a third party that is independent of the employee" and that the information "describes the service or product, the date of service or sale, and the amount of the expense". A dietitian's own itemized receipt is independent third-party information and satisfies that rule. What it cannot supply is the physician's diagnosis, which is a separate document from a separate person.

Three further rules affect how a practice sells. Reimbursing an expense "before the expense has been incurred or before the expense is substantiated" fails the rule, so a prepaid package of sessions is not a clean FSA claim until each session occurs. Special foods and meal products qualify only where the food does not satisfy normal nutritional needs, treats an illness, and is "substantiated by a physician", and then only for the cost above a normal diet. Supplements qualify only where "recommended by a medical practitioner as treatment for a specific medical condition diagnosed by a physician", so the dietitian may be the recommender but not the diagnoser. An administrator that accepts self-certification or favored-provider certification puts the whole cafeteria plan at risk, which is why they are inflexible about receipts. The itemized deduction on Schedule A has a 7.5 percent of adjusted gross income floor.