Dermatology Billing / Case Study

One modifier. Six figures. The E/M revenue hiding inside same-day biopsies.

A busy dermatology group was doing the clinical work of a full evaluation and then giving it away for free every time a lesion got biopsied or destroyed in the same visit. The fix was not a new service line. It was modifier 25, applied correctly, defended with the right note.

The short answer: When a significant, separately identifiable E/M service happens on the same day as a minor procedure like a skin biopsy (CPT 11102 to 11107), append modifier 25 to the E/M code. That single character tells the NCCI edit engine the visit was not just the pre-procedure look, and it converts a bundled denial into paid, defensible revenue.

Modifier 25 is the most audited two digits in dermatology, and also the most under-used. Groups either strip it out to avoid scrutiny and leave real E/M revenue on the table, or they staple it to every claim and invite a takeback.

This is the archetype of a nine-provider group we modeled from documented payer behavior and published 2026 fee schedule values. No client is named, and every figure below is illustrative and traceable to the rules cited on this page, not a specific audited engagement.

The leak, quantified

What a same-day E/M write-off actually costs

Global-period days on biopsy codes 11102 to 11107, so a same-day E/M is never automatically inside a procedure package.

The NCCI PTP modifier indicator that makes the edit conditionally bypassable. Indicator 1 means a modifier can override when documentation supports it.

~40^%

Share of biopsy and destruction visits in the archetype that carried a genuinely separate E/M but were billed procedure-only out of denial fear.

6-fig

Annualized E/M revenue the group had been writing off, recoverable without seeing one additional patient.

Why the denial happens

The path from a good visit to a bundled claim

Every payer runs the same reflex. An E/M line and a same-day procedure line hit the CMS National Correct Coding Initiative procedure-to-procedure (PTP) tables, the edit fires, and the lower-weight line drops. Modifier 25 is the documented exception the edit was designed to allow.

STEP 01

Same-day encounter

Patient presents. Provider evaluates a concern and performs a biopsy or destruction in the same visit.

STEP 02

Two lines billed

E/M code (99202 to 99215) plus the procedure code (for example 11104) go out on one claim.

STEP 03

NCCI PTP edit fires

The pre- and post-procedure work is presumed bundled into the procedure. The E/M is denied as inclusive.

STEP 04

Modifier 25 clears it

Appended to the E/M, it certifies a significant, separately identifiable service. The line pays and holds on audit.

The unique angle

One note, two services: the documentation split that defeats bundling

Modifier 25 is only as strong as the record behind it. The winning pattern is a note the auditor can physically cut in two. The E/M half must stand on its own with no procedure words in it, and the procedure half must be complete without borrowing from the E/M.

Bill with modifier 25

The E/M half

A separate chief complaint or a new or changing problem the patient raised, not just the lesion being treated.
Independent history, exam, and medical decision making that would justify the visit even if no procedure had occurred.
Assessment and plan elements unrelated to the biopsy: a prescription, a full-body skin exam, a distinct diagnosis.
Written before or apart from the procedure note, so the significant, separately identifiable service is visible on its face.

Bill on its own line

The procedure half

Site, technique (tangential, punch, incisional), lesion count, and specimen handling for the biopsy itself.
The routine pre-procedure look and consent, which belong to the procedure and are never counted toward the E/M.
Its own diagnosis linkage, so the biopsy and the E/M each point to the clinical reason that supports them.
Complete without the E/M narrative, proving the two services are genuinely distinct rather than one visit split in two.

Code reference

Skin biopsy family: CPT 11102 to 11107

The 2026 CPT code set organizes skin biopsy by technique, each with a primary code for the first lesion and an add-on for each additional lesion. Reporting the correct base plus add-on is the other half of getting paid, alongside the modifier 25 on the E/M.

CPT	Technique	Reported for	Notes
11102	Tangential biopsy	First lesion	Shave-style sampling of epidermis and portion of dermis.
+11103	Tangential biopsy	Each additional lesion	Add-on. List separately with 11102.
11104	Punch biopsy	First lesion	Full-thickness cylindrical column via punch tool.
+11105	Punch biopsy	Each additional lesion	Add-on. List separately with 11104.
11106	Incisional biopsy	First lesion	Sampling through the dermis, deeper than tangential or punch.
+11107	Incisional biopsy	Each additional lesion	Add-on. List separately with 11106.

When multiple techniques are used, report the single most complex primary code once and the remaining lesions as add-ons, per AMA CPT guidance. Destruction and other same-day minor procedures follow the same modifier 25 logic on the E/M line.

Grounded in current guidance

The 2026 rules this recovery stands on

AMA

CPT Modifier 25

Defines the significant, separately identifiable E/M service by the same physician on the same day as a procedure. The AMA CPT 2026 code set and CPT Assistant remain the source of truth for when it applies.

CMS

NCCI PTP edits & Policy Manual

The 2026 National Correct Coding Initiative PTP tables and Policy Manual set the E/M-with-procedure edits and the modifier indicators (0, 1, 9) that decide whether a modifier can bypass an edit.

AMA CPT

Biopsy codes 11102 to 11107

The technique-based biopsy family with primary and add-on structure, valued under the CMS 2026 Medicare Physician Fee Schedule Final Rule.

PAYER

Same-day E/M edit policies

Commercial and Medicare Advantage plans publish their own same-day E/M and modifier 25 reimbursement policies, some requiring records on submission. Coding to the payer's stated policy is what keeps the payment.

How six figures adds up

The write-off, run through the math

Same-day E/M visits

Biopsy and destruction encounters carrying a genuinely separate evaluation.

~40%

Previously billed procedure-only, with the E/M written off.

Allowed E/M

Level 3 to 4 established-patient allowable under the 2026 MPFS.

Six figures

Recovered annually, with zero added visit volume.

Illustrative model. The multiplier is not aggressive coding, it is correct coding: only visits where the E/M truly stood apart were re-captured, and every one carried the split documentation that survives a modifier 25 audit. Nothing here is a guarantee of results, and the exact figure depends on payer mix, visit levels, and the group's fee schedule.

Where ASP-RCM comes in

We find the modifier 25 leak, then build the note that defends it.

Our dermatology billing team audits your same-day E/M capture against the current NCCI PTP edits, flags where the E/M is being written off, and works with your providers on the documentation split so the revenue holds up on any payer's audit. Correct capture, not aggressive coding.

Want the same look at your own book? See our dermatology billing services.

Book a modifier 25 review

This page is educational and reflects guidance current as of 2026, including the AMA CPT 2026 code set, the CMS National Correct Coding Initiative PTP edits and Policy Manual, and the CMS 2026 Medicare Physician Fee Schedule Final Rule. The group described is an anonymized archetype and all figures are illustrative, not a specific client outcome. It is not legal, coding, or billing advice. Verify coverage and coding against your specific payer policies and current CMS and AMA publications before submission.