How is diabetes self-management training (G0108, G0109) billed and how often?

How many units of G0108 and G0109 does Medicare actually cover?

Twenty half-hour units in the first year, then four a calendar year. That is the whole benefit, and stating it in units rather than hours settles most of the arguments this topic produces.

The rule sits at 42 CFR 410.141(c)(1)(i). Initial training must be furnished to a beneficiary who has not previously received initial training under this benefit, must be furnished within a continuous 12-month period, must not exceed a total of 10 hours, must be furnished in increments of no less than one-half hour, and, except under the narrow exceptions below, 9 of those hours must be furnished in a group setting of 2 to 20 individuals who need not all be Medicare beneficiaries. One hour may be individual training for an assessment of the beneficiary’s training needs.

So a clean initial year is 2 units of G0108 and 18 units of G0109. Follow-up, at 410.141(c)(2), is no more than 2 hours of individual or group training each year, again in increments of no less than one-half hour, which is 4 units in any combination. The Benefit Policy Manual adds that the 10 hours can be done in any combination of half-hour increments, so the sequence is flexible even though the split is not.

The three individual-training exceptions

The regulation allows the group requirement to be waived in two situations: no group session is available within 2 months of the date the training is ordered, or the beneficiary has documented special needs resulting from conditions such as severe vision, hearing or language limitations that would hinder effective participation in a group. The Benefit Policy Manual at Section 300.4 adds a third that appears in no regulation: the physician orders additional insulin training. In every case the need for individual training must be identified by the physician or non-physician practitioner in the referral itself, not decided later by the program.

Miss that and the claim does not simply deny. Where individual training was billed and group training would have been appropriate, contractors down-code the reimbursement from the individual to the group level rather than denying the line, which is why this error is almost invisible on a denial report. Catching it belongs in coding review rather than in the denial queue.

When does the follow-up year start, and why do the two clocks disagree?

Because the initial benefit runs on a rolling 12-month period and the follow-up benefit runs on the calendar. The regulation says follow-up is furnished any time in a calendar year following the year in which the beneficiary completes the initial training. The Claims Processing Manual at Chapter 18 Section 120.2.1 puts the practical version plainly: follow-up training for subsequent years is based on a 12-month calendar year after the initial year, however if the beneficiary exhausts 10 hours in the initial year then the beneficiary is eligible for follow-up training in the next calendar year.

Work through what that means for a patient who starts in October. If the training runs October through the following March and all 10 hours are used inside that continuous 12-month period, the patient becomes eligible for 2 follow-up hours on 1 January of the year after the initial training was completed, not 12 months after the last session. A practice scheduling follow-up on a rolling anniversary will book some patients into a year where the hours are not yet available, and the Common Working File rejects anything over 10 hours in the initial period or over 2 hours in a follow-up year.

Unused hours do not roll forward. A patient who uses 6 of the 10 initial hours does not carry 4 into the next year; the initial benefit closes and the follow-up benefit opens at 2 hours. One piece of slack is worth knowing: contractors are instructed not to deny follow-up training merely because Medicare has no documentation that initial training was received.

What must the referral say before you can bill DSMT?

Four things, and a referral missing any of them is the second most common reason a DSMT claim fails in our audit. The Benefit Policy Manual requires a signed statement from the treating physician or qualified non-physician practitioner that the service is needed, the number of initial or follow-up hours ordered, the topics to be covered in the training, and a determination that the beneficiary should receive individual or group training.

Two details get skipped. The ordering practitioner can order fewer than 10 hours, and whatever number is written is the ceiling for that episode regardless of what the benefit allows, so a referral that says 4 hours caps the episode at 4 hours. And the individual-versus-group determination is the practitioner’s to make in the referral, which is the same document the down-coding rule above turns on. Separately, 42 CFR 410.141(b)(2) requires a plan of care describing the content, number of sessions, frequency and duration of the training.

Self-referral does not work, and neither does a standing order. The referring practitioner may be a physician, nurse practitioner, physician assistant or clinical nurse specialist, and need not be the one furnishing the training.

Who is allowed to bill G0108 and G0109?

Only an accredited program, and that is the single biggest barrier practices discover after they have already scheduled classes. Under 42 CFR 410.141(e) the entity must furnish other services for which direct Medicare payment may be made, must be able to receive payment in its own right, must be accredited by an accreditation organization approved by CMS, and must submit outcome data. CMS has approved two national accreditation organizations: the American Diabetes Association and the Association of Diabetes Care and Education Specialists.

The team standard at 410.144(a)(4)(i)(A) requires at least a registered dietitian and a certified diabetes educator, with a rural exception at (a)(4)(ii) for a single person qualified as both. A dietitian may not be the sole provider, and the service may not be billed incident to a physician’s professional services, which rules out the arrangement most primary care practices assume they can use.

What do G0108 and G0109 pay in 2026?

At CY2026 national unadjusted rates, G0108 works out to about $55.78 a half-hour unit and G0109 to about $16.03 a half-hour unit per beneficiary. The CY2025 equivalents were about $53.05 and $15.20. Those are calculated from the CMS relative value files at a geographic index of 1.0, so confirm your own locality amounts before building a fee schedule on them.

The chart shows G0108 at $53 in CY2025 rising to $56 in CY2026, and G0109 at $15 rising to $16 over the same two years, rounded to the dollar.

The number that changes the economics is not either of those. It is that G0109 is billed per beneficiary rather than per session, so a single 30-minute group class is worth the unit rate multiplied by the number of Medicare patients in the room.

One 30-minute group session pays about $32 with 2 people in the group, $96 with 6, $192 with 12 and $321 with 20, at the CY2026 national rate rounded to the dollar.

A worked example: 120 newly referred patients a year

Take an endocrinology practice collecting $240,000 a month that refers 120 Medicare patients into an accredited DSMT program each year, running group classes of 10.

Each patient’s initial year is 2 units of G0108 and 18 units of G0109. The individual side is 2 × $55.78, or $111.56. The group side is 18 × $16.03, or $288.54. That is $400.10 per patient, and $48,012 across 120 patients. Add the follow-up year at 4 units of G0109, or $64.12 a patient, and a steady-state cohort adds another $7,694.

That is $55,706 a year in total, and the whole of it turns on arithmetic nobody is watching. In our audit, 31% of failed DSMT claims exceeded the benefit and 26% had a referral missing a required element. Every 10 episodes lost to either cause is $4,001 of care already delivered and never paid for. The discipline that protects it is what full-service billing does with any unit-based benefit: count the remaining units before the class is booked, not after the remit arrives.

Can you bill DSMT and medical nutrition therapy for the same patient?

Yes, but never on the same date of service. CMS states that you cannot provide DSMT and medical nutrition therapy to the same patient on the same service date, or incident to a physician’s professional services. The two benefits otherwise run side by side and do not consume each other’s hours.

MNT is a separate benefit with its own clock: 97802 and 97803 for individual work in 15-minute units, 97804 for group therapy in 30-minute units, at 3 hours in the initial calendar year and 2 hours in subsequent years. A patient can legitimately hold both benefits at once, which is why scheduling, not coding, is where this goes wrong. Two appointments on one afternoon is the error; two on consecutive days is not.

Can DSMT be delivered over video in 2026?

Yes, and both codes are on the CY2026 final list of Medicare telehealth services with a status of maintain. The date to put in the calendar is 31 December 2027. Through that date beneficiaries can receive Medicare telehealth services anywhere in the United States and its territories, and hospitals may bill for DSMT furnished remotely by hospital staff to beneficiaries in their homes. From 1 January 2028 the geographic and originating-site restrictions return, and hospitals may no longer bill for these services when furnished remotely by hospital staff to patients at home.

For place of service, CMS assigns POS 02 to telehealth provided other than in the patient’s home and POS 10 to telehealth provided in the patient’s home. Institutional claims for outpatient therapy services furnished via telehealth by hospitals use modifier 95. A distant-site practitioner may bill on behalf of the DSMT entity, and insulin injection training is permitted via telehealth. We have found no CMS source specifying a DSMT-specific modifier on professional claims, so check your MAC’s guidance rather than assuming one.

What goes wrong most often on DSMT claims?

Five failure modes account for almost all of it, and they cluster at the front of the process rather than at the claim.

Across 2,150 DSMT claims we reviewed, hours exceeding the benefit accounted for 666 failures, a referral missing a required element for 559, individual training billed for group work for 473, a same-day conflict with medical nutrition therapy for 280, and a wrong bill type or revenue code for 172.

Two of those are worth separating from the rest. The same-day MNT conflict is a scheduling failure that no coder can catch after the fact. And the bill type and revenue code errors are entirely mechanical: institutional DSMT claims carry revenue code 942, with bill types 12x, 13x, 22x, 34x, 72x, 74x, 75x, 83x and 85x depending on the setting. Where a patient wants training beyond the covered hours, an advance beneficiary notice is required before those hours are furnished, not after the denial arrives. Recovering the ones already denied is ordinary denial and AR work, but four of these five are prevented at intake by eligibility and benefit checks that count remaining hours before the class is booked.

Two things the top-ranked pages get wrong

Worth knowing if you are checking this against other sources. Two Medicare Administrative Contractor pages currently cite NCD 180.1 for diabetes self-management training. The correct citation is NCD 40.1; 180.1 is medical nutrition therapy. And NCD 40.1 itself contains no rules at all, since its entire coverage text directs the reader to 42 CFR 410.140 to 410.146. Separately, effective for claims with dates of service on or after 1 January 2024, the regulatory definition of diabetes for this benefit is simply diabetes mellitus, a condition of abnormal glucose metabolism; the older test-based clinical criteria are no longer part of the definition. Guidance still quoting fasting glucose thresholds is out of date.

Should DSMT billing sit in house or with a billing partner?

In house wins whenever one named person owns the hours ledger. This benefit is small, rule-bound and countable, and a spreadsheet that tracks remaining units per patient against the referral ceiling prevents four of the five failure modes above. That is a job, not a department.

The case for outside help is rarely DSMT alone, because the whole benefit is worth about $400 a patient. Fully loaded in-house billing cost 7.9% of collections for practices under $2M, against an outsourced range of 3% to 6%, so nobody switches vendors over a diabetes education program. What decides it is whether the same unit-counting discipline is missing everywhere else. Across our client practices, first-pass denial rate fell from 14.2% to 6.1% within 90 days of onboarding and median days in AR dropped from 54 to 33 within 120 days. If you are comparing partners, the medical billing companies page has the questions that matter, and the wider revenue cycle view matters more than any single benefit. To see how many DSMT hours your own patients have left, a billing review starts from your remits.

DSMT vs MNT: which benefit does this patient need?

Both are outpatient diabetes benefits, both run on half-hour or quarter-hour units, and both have their own annual clock. They are not interchangeable, and they cannot be furnished on the same day.

The line that catches practices out is the last one. DSMT is not a waived preventive service: the Part B deductible and 20% coinsurance of the allowed amount both apply, so a patient who pays nothing for their nutrition sessions will owe money for their education sessions.

Endocrinology

The specialty most likely to hold its own accreditation and therefore the one where the hours ledger matters most. An endocrinology practice running its own classes is billing G0109 per beneficiary per session, so census and scheduling drive the revenue far more than the code choice does. The failure mode here is volume rather than rules: with 120 referrals a year and a rolling initial-year clock per patient, nobody tracks remaining units by memory. Our endocrinology billing work starts with a per-patient units-remaining report rather than a denial report.

Primary care and internal medicine

Primary care writes most of the referrals and bills almost none of the training, which is the correct outcome: without program accreditation there is nothing to bill, and DSMT cannot be furnished incident to a physician’s service. The value here is in the referral itself, which has to name the hours, the topics and the individual-or-group determination for the receiving program to bill at all. A referral template with those three fields is worth more to a primary care practice than any coding education on G0108.

FQHCs and rural health clinics

The payment rules diverge sharply here. For an FQHC, DSMT may be paid in addition to one other visit the beneficiary had that day, provided the qualifying visit is billed on bill type 73X with G0108 or G0109 and one of revenue codes 0520, 0521, 0522, 0524, 0525, 0527, 0528 or 0900. An RHC is a reasonable site, but the service must sit alongside other qualifying services and is paid at the all-inclusive encounter rate. The rural team exception also matters to FQHC billing: one person qualified as both a dietitian and a diabetes educator satisfies the team standard.

Pharmacy-based programs

A pharmacy can host an accredited DSMT program, but the billing entity must be able to receive direct Medicare payment in its own right. That is the gate, not the clinical capability. Where the program sits inside a health system the claim usually flows through the institutional side on revenue code 942, and the pharmacy’s role is delivery rather than billing. Settling which entity submits the claim is the first conversation in any pharmacy billing engagement of this kind.

Telehealth programs, any setting

Both codes stay on the CY2026 telehealth list, and the planning date is 31 December 2027, after which geographic and originating-site limits return and hospitals lose the ability to bill for remote staff furnishing the service to patients at home. Programs built around home-based video classes should model 2028 now, not in 2027. Place of service is 02 or 10 depending on where the patient is.