What are the most common reasons my 97802 and 97803 claims get denied?

Nutrition therapy denials cluster into a short list. In most practices the same six or seven causes account for nearly everything that comes back unpaid: the initial assessment code used on a visit that was really a follow up, time units that do not match the documented face to face minutes, a diagnosis the plan does not accept as supporting medical necessity, benefit units already exhausted earlier in the year, a telehealth place of service or modifier that does not match the payer's policy, and a missing physician referral where one was required.

None of these are mysterious. All of them are preventable at the front end, which is the good news, because appealing a denial costs you far more time than avoiding it. A clean claim pays in two to four weeks. A denied claim that needs a corrected submission plus a written appeal can eat forty five minutes of your unpaid time and still land in the same place.

Here is what each cause looks like in practice and what to change so it stops happening.

Using 97802 when the visit was a follow up

The distinction is not about how long ago you saw the patient. It is about whether the visit is the initial assessment and intervention for that episode of care.

• 97802 is medical nutrition therapy, initial assessment and intervention, individual, face to face, per fifteen minutes. It is billed once per episode of care.
• 97803 is reassessment and intervention, individual, per fifteen minutes. Every subsequent visit in that episode.
• 97804 is group medical nutrition therapy, two or more individuals, per thirty minutes.

Where practices get burned: a patient returns after nine months away and it feels like starting over, so 97802 goes on the claim again. The payer's system sees a second initial for the same beneficiary and denies it as a duplicate service or as exceeding frequency limits. Some payers will allow a new initial after a new referral or a new diagnosis in a new calendar year; many will not without documentation. If you genuinely believe a new episode has begun, document why in the note before you bill it, and be ready to send that note with an appeal.

There are also the G codes, G0270 and G0271, used for reassessment and intervention following a second referral in the same year when there has been a change in diagnosis, medical condition or treatment regimen. If your payer follows Medicare rules, that is the correct path for additional hours beyond the initial annual allowance, not a repeat of 97802.

Keep reading: What does HIPAA actually require from me as a solo dietitian using a meal plan app?

Counting 15 minute time units correctly

Nutrition therapy codes are timed codes. Units are based on documented face to face time with the patient, not on the length of the appointment slot, not on time spent charting afterward, and not on time the patient spent in your waiting room.

Most payers apply the standard time rule for timed codes: a unit requires more than half of the increment, so more than eight minutes of a fifteen minute unit. A common application looks like this:

Documented face to face minutes	Units billed
8 to 22	1
23 to 37	2
38 to 52	3
53 to 67	4
68 to 82	5

Confirm your specific payer's policy, because a few apply their own rounding. Then apply two habits. Write actual clock times in every note: "start 10:02, end 11:00, 58 minutes face to face." And never let the units be generated from the appointment length in your scheduler. A sixty minute slot that ran fifty one minutes is three units, not four, and a payer audit that finds a pattern of fours on fifty minute visits is a recoupment waiting to happen.

Diagnosis codes that do not support medical necessity

The ICD-10 code on the claim tells the payer why the service was medically necessary. If the code is not on that plan's covered list for nutrition therapy, the claim denies regardless of how good your note is.

Two failure patterns are common. The first is coding only a symptom or a lifestyle code when a covered condition is present and documented, for example coding a general counseling encounter when the patient has documented type 2 diabetes. The second is the opposite: coding a condition you have not documented and cannot support, which is a compliance problem, not a billing shortcut.

What to do instead. Before the first visit, ask the payer which diagnosis codes it accepts for 97802 and 97803, or find the plan's medical policy for medical nutrition therapy on its provider site. Order your codes with the condition driving the visit in the primary position. If a physician referral names a diagnosis, use it and keep the referral in the chart. And make sure the note actually supports the code: assessment, nutrition diagnosis, intervention, and a plan for monitoring and evaluation. The ADIME structure exists partly because it produces exactly the elements a reviewer looks for.

Keep reading: How did one dietitian rebuild her practice around group visits instead of one on ones?

Benefit unit limits and how to verify them before the visit

Nearly every plan caps nutrition therapy. Caps come as visits per calendar year, units per year, hours per year, or a combined cap shared with other therapies. Medicare's medical nutrition therapy benefit, for the conditions it covers, is three hours in the first calendar year and two hours in subsequent years, with additional hours available on a second referral when the treating physician documents a change.

The trap is that the counter runs across all providers. A patient who saw a hospital outpatient dietitian in February may have used most of the year's units before she ever booked with you.

Verify before the first visit, and re verify at the start of each calendar year. On the call, capture:

1. Is medical nutrition therapy a covered benefit under this plan.
2. Units or visits allowed per calendar year, and how many remain today.
3. Whether the cap is shared with physical, occupational or speech therapy.
4. Deductible status, copay or coinsurance amount.
5. Whether a referral or prior authorization is required, and by whom.
6. Covered diagnosis codes.
7. Telehealth coverage and any place of service requirement.
8. The representative's name, the date and a call reference number.

That reference number is the single most valuable thing on the list. It is what turns "we were told it was covered" into an appealable position.

Telehealth place of service and modifier errors

Virtual visits deny for mechanical reasons more often than for policy reasons. The claim fields have to agree with each other and with the payer's telehealth rules.

The pieces that must line up: the place of service code, where 02 indicates telehealth provided somewhere other than the patient's home and 10 indicates telehealth provided in the patient's home; the modifier, commonly 95 for synchronous audio and video, with 93 used for audio only where a payer allows it; and the documentation, which needs to record the modality, the patient's physical location, your location and the patient's verbal consent to a telehealth visit.

Payers differ, and their rules change. Some want POS 10 with no modifier. Some want the office POS with modifier 95. Some do not cover audio only for nutrition at all. Keep a one page grid in your billing folder listing, for each contracted payer, the POS code and modifier that pays. Update it whenever a policy bulletin lands, and check it before you submit the first telehealth claim for any new payer.

See how NourishPlanner handles this for dietetics and nutrition counseling

Referral and documentation requirements by payer

Medicare requires a referral from the treating physician for medical nutrition therapy. Many commercial plans do not, but some do, and some HMO products require a referral routed through the primary care physician before the visit occurs. A referral obtained after the date of service is often not accepted.

Keep in the chart, for every billed visit: the signed referral where required, the verification of benefits with the reference number, a note containing start and end times, the nutrition assessment and diagnosis, the intervention delivered, the monitoring plan, and your signature with credentials and date. If a payer requests records, you want to send one complete packet, not assemble it from four places.

How to read a remittance advice and appeal cleanly

The remittance advice tells you exactly why, in codes. Learn to read three fields: the claim adjustment group code, which is CO for contractual obligation, PR for patient responsibility, or OA for other; the claim adjustment reason code, the numeric reason; and the remittance advice remark code, which adds detail.

Sort denials by that reason code weekly rather than working them one at a time. Ten claims with the same code are one fix, not ten.

• PR with a deductible reason: not a denial. Bill the patient the allowed amount.
• Non covered or benefit exhausted: verify the unit count, then move the patient to your cash rate with a written agreement.
• Diagnosis inconsistent with procedure: a coding fix. Submit a corrected claim, not an appeal.
• Duplicate or frequency exceeded: usually the 97802 problem above.
• Missing information: almost always a claim field, not a clinical issue. Fix and resubmit.

When you do appeal, keep it to one page: patient and claim identifiers, the denial reason quoted back, one paragraph stating why the service was covered and necessary, and the attachments that prove it. Watch the appeal deadline, often one hundred and eighty days from the remittance date, and file inside it.

Fewer denials starts before the claim

Almost everything above comes down to two disciplines: verify benefits with a reference number before the first visit, and write notes that state times, diagnoses and interventions precisely enough that a reviewer never has to guess. Do those two things and your denial rate drops without a single extra appeal.

The third discipline is keeping patients engaged long enough to use the visits their benefit allows. NourishPlanner delivers each client a realistic weekly meal plan on Sunday night and collects a brief daily check in, so your reassessment notes have concrete evidence of what changed since the last visit. That is better clinical care, and it is also documentation that holds up when a payer asks why the follow up was necessary.