Prolonged Services Billing 2026 (99417, G2212, G0316)

Why Medicare Won't Pay the Code Your Biller Keeps Sending

By Yagnesh Dave  ·  September 29, 2026  ·  11 min read

Your biller sends 99215 plus 99417 on a 78-minute Medicare visit. Medicare denies the add-on line, and the $34.07 you should have collected never shows up. Multiply that by 15 long visits a month and you're leaving about $6,100 a year on the table, from a code Medicare doesn't even accept.

That's the heart of prolonged services billing in 2026. CPT has one set of rules, Medicare has another, and a lot of practices run both through the same claim scrubber. The result is either a denial you didn't expect or a payment you never asked for because nobody coded the visit right.

Here's how the codes work, where Medicare and CPT split, what the 2026 rates are, and the time documentation that holds up when someone reviews the claim.

Prolonged Services Billing: 99417 vs G2212 vs G0316

Prolonged services are add-on codes. They pay for time beyond the top of the base visit, and they only exist when you've picked the base level using total time on the date of the encounter. Three codes matter for most practices.

Rates come from CMS's October 2026 relative value file at the $33.4009 conversion factor. Commercial payers set their own, and many price 99417 close to the Medicare figure for G2212.

Notice the pattern. For each setting, Medicare created its own HCPCS code instead of adopting the CPT one. That's why a single prolonged-visit workflow breaks the moment your payer mix includes Medicare and a commercial plan.

The 69 and 89 Minute Rules for Medicare Prolonged Visits

The CPT and Medicare thresholds differ by 15 minutes, and that gap is where most mistakes start. CPT lets you report 99417 once you pass the time range of the base code. Medicare makes you pass the maximum time of the base code first, then count 15-minute blocks from there.

So a 60-minute established-patient visit is a plain 99215 for Medicare, but under CPT it already earns one unit of 99417 because it passed 55 minutes. Same visit, two different claims. At 70 minutes, Medicare pays 99215 plus one unit of G2212. At 84 minutes, it's two units, and so on in 15-minute steps.

Inpatient and Observation: G0316 and the 90 Minute Mark

Medicare added G0316 for hospital inpatient and observation visits starting in 2023, and the thresholds follow the same logic. CMS corrected the numbers in March 2023, so older cheat sheets are wrong. G0316 starts at 90 minutes with initial hospital care 99223, and at 65 minutes with subsequent care 99233.

The rate is $34.74 per unit in 2026. That sounds small until you look at a hospitalist who spends 110 minutes on a complex admission. That's 99223 at $156.32 plus one unit of G0316 at $34.74, a $191.06 visit instead of $156.32. A hospitalist group doing 10 of those a week collects about $18,000 a year more than a group that stops at the base code.

Two rules trip people up. G0316 can't share a date of service with 99358, 99359, 99415, 99416 or 99418, and you can't bill it for a partial 15-minute block. Fourteen minutes past the threshold earns nothing.

What Time Counts in Prolonged Services Documentation

CMS and CPT both count the physician's own time on the date of the visit. The two lists below are the ones auditors check against the note.

Time you can count

• Preparing to see the patient, including reviewing tests and outside records
• Taking a history and doing a medically appropriate exam
• Counseling and educating the patient, family or caregiver
• Ordering medications, tests or procedures
• Referring and communicating with other health care professionals when it isn't separately reported
• Documenting in the record
• Independently interpreting results and coordinating care

Time you can't count

• Clinical staff time
• Travel
• Teaching that isn't part of the patient's care
• Time spent on separately reported services
• Time on another date

In a teaching setting, only time when the teaching physician was personally present counts. Resident time doesn't. Medicare also doesn't let you add 99358 or 99359 to an office visit billed on the same day, and those two codes show status I in the 2026 file anyway.

Where Prolonged Services Denials Come From

Most denials trace to a short list. Knowing it saves you from chasing every rejection one by one.

• 99417 sent to Medicare. It denies or rejects outright. Switch to G2212.
• Level chosen by MDM. A 99215 chosen by MDM can't take a prolonged add-on, even if the visit ran 90 minutes.
• Threshold miscount. Billing G2212 at 55 or 60 minutes because the CPT rule said 55 minutes.
• Same-day conflicts. Adding prolonged codes to a date that already has 99358, 99359, 99418 or another time-based service.
• Missing time statement. A note without a total time, or with time spread across several dates.
• Wrong base code. G2212 attaches to level 5 visits (99205 and 99215) and to 99483 for cognitive assessment, never to level 3 or 4 visits.

A practice sending 40 prolonged lines a month with a 25% error rate loses about 10 add-ons, around $340 a month at the Medicare rate. It's small money each time and big money across a year.

OIG and Audit Exposure for Prolonged and High-Level E/M

High-level E/M services get audited because there's real money in them, and a prolonged add-on makes a level 5 visit look even higher. Here's what the reviewers have been finding.

CMS's fiscal year 2025 improper payment data puts the Part B provider error rate at 8.44%, or $9.62 billion, and insufficient documentation drove about 53% of improper payments across Medicare fee-for-service. That's a documentation problem, not a coding-knowledge problem.

The Office of Inspector General has also been looking at E/M specifically. A December 2025 audit of optometrists found that all 399 sampled lines billed as high-level nursing facility E/M services failed Medicare requirements, with an estimated $3 million in overpayments. An earlier dermatology audit estimated $62.9 million in overpayments, with 10 of 100 sampled E/M services failing. Neither audit was about prolonged services, but both show how reviewers sample high-level E/M and test the note against the code.

Medicare contractors can reopen a claim within 1 year for any reason and within 4 years for good cause, and recovery auditors generally look back 3 years. If a pattern of prolonged add-ons turns out to be wrong, the repayment clock under the 60-day rule starts when you find it. Run an internal sample of your level 5 visits every quarter so you're the one who finds it first.

Frequently Asked Questions About Prolonged Services Billing

Does Medicare pay CPT 99417?

No. Medicare doesn't accept 99417 for prolonged office and outpatient visits. It uses HCPCS code G2212 instead, and in the October 2026 fee schedule file 99417 carries status I, which means it isn't valid for Medicare payment.

How many minutes do I need before billing G2212?

For a level 5 established visit, total time on the date of service must reach 69 minutes before you bill one unit of G2212. For a level 5 new patient visit, it's 89 minutes. Each additional 15 minutes adds one more unit.

Can I bill prolonged services if I chose the E/M level by medical decision making?

No. Prolonged office and outpatient codes only apply when the base 99205 or 99215 was selected using total time on the date of the encounter. If you picked the level by MDM, there's no prolonged add-on.

Does clinical staff time count toward prolonged services?

No. Only time spent personally by the physician or other qualified health care professional counts, and only on the date of the encounter. Staff time, travel and teaching time don't count.