CPT 15101Surgery

Splt agrft t/a/l ea addl 100

CPT code 15101 is used when a surgeon applies an additional 100 square centimeters (about the size of a smartphone screen) of split-thickness skin graft to areas like the trunk, arms, or legs. This is an add-on code used in conjunction with the primary skin graft procedure code.

Showing rates for

National Average

Base Medicare rate

$178.55

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.72

PE RVU (NF)

3.41

MP RVU

0.39

Total RVU

5.52

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Always bill 15101 with the appropriate base code (15100 for trunk/arms/legs first 100 sq cm) - 15101 cannot be billed as a standalone code
Impact: Billing without base code results in 100% claim denial; ensures full reimbursement of $178.55 per additional 100 sq cm unit non-facility
Measure and document exact graft dimensions in operative report (length × width in cm) and calculate total square centimeters precisely to justify number of units billed
Impact: Prevents downcoding and audits; each accurately documented unit worth $178.55 non-facility rate, so precise measurement maximizes legitimate reimbursement
Bill facility vs non-facility location correctly - verify place of service code matches actual location to determine applicable rate ($178.55 non-facility vs $107.07 facility)
Impact: Incorrect POS coding can result in $71.48 payment difference per unit or claim rejection requiring rebilling and payment delays
Report units based on actual grafted area, not donor site size or prepared graft size that wasn't applied - only count tissue actually applied to recipient site
Impact: Overbilling unused graft tissue is a common audit trigger; proper reporting prevents recoupment demands and potential fraud allegations
When grafting multiple separate anatomical sites, document each site separately and consider modifier 59 to prevent inappropriate bundling of distinct procedures
Impact: Proper documentation and modifier use can preserve payment for multiple units that might otherwise be denied as duplicates, protecting $178.55+ per unit
Link to appropriate ICD-10 diagnosis codes documenting medical necessity (burns T20-T28, traumatic wounds S01-S99, post-excision defects) with specificity including TBSA for burns

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Frequently asked questions

What is CPT code 15101 used for?

CPT 15101 is an add-on code used to bill for each additional 100 square centimeters of split-thickness skin graft applied to the trunk, arms, or legs beyond the first 100 sq cm (which is reported with base code 15100). It cannot be billed alone and must accompany the primary graft code.

How much does Medicare pay for CPT 15101 in 2025?

Medicare pays $178.55 for CPT 15101 in non-facility settings and $107.07 in facility settings based on the 2025 national average rates. Actual payment may vary by geographic location due to locality adjustments.

How many units of 15101 can I bill?

You can bill as many units of 15101 as are medically necessary and supported by documentation, with each unit representing an additional 100 square centimeters of graft beyond the first 100 sq cm. Calculate total grafted area and divide by 100, rounding down to the nearest whole number for units beyond the base code.

What is the difference between CPT 15100 and 15101?

CPT 15100 is the base code for the first 100 square centimeters or less of split-thickness graft to trunk/arms/legs, while 15101 is the add-on code for each additional 100 sq cm. You must bill 15100 first, then add 15101 for additional area in 100 sq cm increments.

Can CPT 15101 be billed with modifier 51?

No, CPT 15101 is designated as an add-on code and is exempt from modifier 51 (multiple procedures). Add-on codes are not subject to multiple procedure payment reductions and should not have modifier 51 appended except in rare payer-specific circumstances.

What diagnosis codes support medical necessity for CPT 15101?

Appropriate ICD-10 codes include burn codes (T20-T28 with TBSA documentation), traumatic wound codes (S01-S99), post-surgical defect codes, chronic ulcer codes (L89, L97, L98), and codes for skin loss following infection or necrosis. The diagnosis must clearly justify the extent of grafting performed.

Do I need prior authorization for CPT 15101?

Prior authorization requirements vary by payer and setting. Many commercial insurers require pre-authorization for skin grafting procedures, particularly for multiple units or elective reconstructive procedures. Medicare typically does not require prior authorization but may conduct post-payment review. Always verify with the specific payer before the procedure.