E/M coding and modifier 25 for pain procedures
Same-day E/M billed against an injection or ablation is the most audited claim pattern in interventional pain, and a 2025 federal audit of the same pattern elsewhere just showed exactly what an auditor finds when they pull the chart. This guide goes past the "document a significant, separately identifiable service" rule everyone already knows, into the two decisions that actually determine whether the claim survives review: how to level the E/M when the procedure eats most of the time in the room, and how to structure the note so it reads as its own encounter, not narration around the procedure.
Key takeaways
- A 2025 OIG audit found modifier 25 unsupported in 22 of 24 sampled same-day-injection E/M claims. The report covered eye injections, but the pattern it flagged is structurally identical to a procedure-day pain visit.
- Time-based leveling almost never works on a procedure day. Total time excludes time spent on the procedure itself — medical decision making is the method that actually holds up.
- The note must show MDM that stands apart from the decision to inject. A restated pre-procedure checklist isn't a separate E/M no matter what level gets billed on top of it.
- Most modifier 25 denials on pain claims land as CO-97 — whether it's correct or appealable depends entirely on what the note documents, not on whether the modifier was technically allowed.
The 2025 audit finding, and why it matters here
In May 2025, HHS's Office of Inspector General published Report A-09-23-03014, examining Medicare E/M services billed with modifier 25 on the same day as intravitreal eye injections. Auditors sampled 24 such claims from a June 2022–May 2023 window and found documentation failed to support modifier 25 in 22 of them. Nationally, the report identified roughly $124 million in Medicare payments at risk on this exact pattern, and OIG recommended CMS expand medical review rather than let system controls keep waving these claims through (OIG Report A-09-23-03014, issued 05/27/2025).
That report is ophthalmology, not pain management — be precise about that with anyone you cite it to. But it shows exactly what a federal chart review looks for in this billing shape: a high-frequency, low-complexity injection procedure paired with a same-day E/M appended with modifier 25 by default. Interventional pain fits that description as well as ophthalmology does, and a program-integrity contractor building a review list from this finding has no reason to stop at eye injections. Treat it as a preview of what your own documentation needs to survive, not as someone else's problem.
Pick medical decision making, not time, on a procedure day
The current outpatient E/M framework lets you level by total time or by medical decision making (MDM). On a day with no procedure, time is often the faster path. On a procedure day it almost never is: total time excludes any time spent on a separately reported procedure performed that day, including the pre- and post-procedure work already bundled into the procedure code. A physician who spends five minutes on a distinct E/M problem and twenty-five performing an epidural or RFA can only count the five toward the E/M level.
Run that math before defaulting to time on any procedure-day claim. Five minutes doesn't reach even the lowest established-patient level (99212 starts at 10 minutes) — which either forces the visit down to a level the documentation doesn't need to support, or tempts a coder to fold procedure time back into the total, exactly the pattern a payer's time-versus-note-length comparison is built to catch. MDM sidesteps the problem: it's scored on the complexity of the problem and the decision made, not on a clock the procedure keeps eating into.
| Established patient | Total time | New patient | Total time |
|---|---|---|---|
99212 | 10–19 min | 99202 | 15–29 min |
99213 | 20–29 min | 99203 | 30–44 min |
99214 | 30–39 min | 99204 | 45–59 min |
99215 | 40–54 min | 99205 | 60–74 min |
If the practice does document by time, the note needs an explicit statement that the total time recorded excludes the separately reported procedure. Without that line, a reviewer can't tell a properly carved-out entry from one that quietly includes the procedure, and the claim reads as the latter by default.
Leveling by MDM on a pain procedure day
MDM is scored across three elements — problems addressed, data reviewed, and risk of complications from the management decisions made — and the level is set by whichever two of the three are met or exceeded. The table below maps levels to how they typically play out in a pain practice; it's a working guide, not a substitute for scoring each visit against the current CPT MDM table.
| Level | Typical scenario on a procedure day |
|---|---|
99212 / 99202 | Minimal, self-limited issue unrelated to the procedure; rarely defensible as a separate billable E/M on its own |
99213 / 99203 | One stable chronic problem addressed independently of the injection, e.g. a routine, unchanged opioid regimen reviewed without a dose change |
99214 / 99204 | A new or worsening problem (new radicular pattern, medication side effect), or prescription drug management with an actual dose change or PDMP-driven decision — moderate risk on its own |
99215 / 99205 | Multiple chronic conditions with exacerbation, or a decision involving drug therapy requiring intensive monitoring for toxicity — high complexity independent of the procedure |
Prescription drug management counts toward the moderate-risk MDM element under current CPT guidance, which is why a visit that only continues a stable opioid regimen without a dose change or a new risk discussion usually lands at 99213, not 99214 — the drug management has to involve an actual decision, not a renewal on autopilot, to carry the higher level.
Write the E/M assessment and plan as a section that would still make complete clinical sense if the procedure note were deleted entirely. If a reviewer can't tell what problem was being managed, or why, without reading the procedure documentation next to it, the E/M isn't separately identifiable on paper — regardless of whether it was separately identifiable in the room.
Documentation architecture: two problems, two notes
The most defensible structure is the simplest one: a distinct E/M note addressing a distinct problem, followed by a distinct procedure note — not one merged note where the E/M content is scattered through the procedure's own assessment line. Reviewers read for structural separation first, because it's the fastest signal of whether two services actually happened or one got billed as two.
- 1Chief complaint distinct from the procedure indication. "Follow-up for scheduled ESI" doesn't support a separate E/M; a new symptom, a medication issue, or an unrelated chronic condition does.
- 2History and exam that stand on their own, not a restatement of the pre-procedure history and physical already required for the injection.
- 3MDM that reaches a decision independent of "proceed with injection" — a medication change, an order, a differential worked through — something a reviewer can point to as the E/M's own outcome.
- 4Time statement, if billing by time, that explicitly excludes procedure time. Otherwise assume MDM is the only workable path.
- 5Modifier 25 appended to the E/M line only, never as a default entry on every procedure-day encounter regardless of what actually happened.
How these claims deny, and when it's worth appealing
Most modifier-25 denials on a pain procedure day land as CO-97 — the benefit for the E/M is included in the payment already made for the procedure. That's correct whenever the note doesn't independently support a separate service, and it's not an outcome an appeal can fix after the fact; rewriting a note to sound separate after a denial is a compliance problem in its own right, not a legitimate correction.
It's worth appealing when the original note already documents a genuinely distinct history, exam, and MDM, and the payer processed the modifier as a blanket bundling edit without a human reviewing the record — routine on first-pass automated adjudication. Attach the note, point specifically to the distinct problem addressed and the decision made, and request reconsideration rather than resubmitting unchanged. A generic letter asserting the visit was "medically necessary" without pointing to specific documentation elements repeats the same gap OIG found in 22 of 24 sampled claims, just moved to the appeal.
Not sure your pain practice's modifier 25 documentation would survive an audit?
We'll pull a sample of your recent procedure-day E/M claims, score the MDM against what's actually documented, and show exactly which ones would and wouldn't hold up.
Frequently asked questions
Can we level a procedure-day E/M by time instead of medical decision making?
Technically yes, but it rarely works in practice. Total time excludes any time spent on a separately reported procedure performed the same day, including the injection or ablation itself and its own pre- and post-procedure work. Once that time is carved out, what's left of the visit usually doesn't reach a defensible level, which is why medical decision making, not time, is the leveling method that holds up for most same-day pain procedure claims.
Does the 2025 OIG finding on modifier 25 apply to pain management specifically?
The report itself (A-09-23-03014) audited E/M services billed with modifier 25 on the same day as intravitreal eye injections, not pain procedures, and found documentation didn't support modifier 25 in 22 of 24 sampled claims. It doesn't establish a pain-specific finding. But the pattern OIG flagged — a high-volume, low-complexity injection paired with routine same-day E/M billing — describes interventional pain at least as well as ophthalmology, and OIG's recommendation that CMS expand medical review makes similar scrutiny reasonable to expect in other injection-heavy specialties.
What's the most common reason a modifier 25 claim on a pain procedure day gets denied or recouped?
The note doesn't document medical decision making independent of the decision to perform the injection. A line stating the patient still has the pain the procedure was already scheduled to treat is pre-procedure assessment, already bundled into the procedure's payment, not a separate E/M service. The claim usually denies as CO-97, benefit included in the payment for another service already adjudicated, and an appeal only succeeds if the note shows a genuinely distinct history, exam, and decision making — not if it's rewritten after the fact to sound like one.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.