$117.08–$126.11
Use Q4138 for BioDflex DryFlex and Q4140 for BioDfence. The product name, not the shared area-based unit, distinguishes these codes.
On this page
CMS RVU26D · Effective 2026-10-01
Q4138 Wound matrix Medicare reimbursement rates in Maine
Reports one-square-centimeter units of BioDflex DryFlex, a dehydrated amniotic tissue product applied to a prepared wound bed during wound care. Compare Q4138 office and facility rates across CMS payment localities in Maine.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for Q4138 in Maine?
Maine has 2 payment localities in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the 2 payment areas shown below, using the same CMS release.
Office / nonfacility
$117.08–$126.11
2 of 2 localities have a supported rate.
Facility setting
No supported rate
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Skin substitute products
About Q4138: BioDflex dry amniotic wound matrix
Reports one-square-centimeter units of BioDflex DryFlex, a dehydrated amniotic tissue product applied to a prepared wound bed during wound care.
BioDflex DryFlex is a dehydrated amniotic tissue allograft supplied for placement over a prepared wound. Wound care clinicians, podiatrists, and surgeons may use it in outpatient wound clinics, physician offices, or hospital settings when treating wounds such as diabetic foot or venous leg ulcers. The product is placed on the wound bed as part of the treatment; the code represents the product, not the clinical work of preparing and treating the wound.
Report units on the code’s one-square-centimeter basis, and document the product used, wound site and dimensions, and the amount applied. CMS classifies Q4138 as an add-on code: report it only with a primary procedure, and its payment falls within that procedure’s global period. CMS also classifies it as technical-component-only, with a separate code covering interpretation.
CMS billing rules for Q4138
- Global period
- Add-on code: billed only together with a primary procedure and paid within that procedure's global period.
- Professional and technical components
- Technical-component-only code: a separate code covers interpretation.
Where the value comes from
- Work RVU0.00 · 0%
- Practice expense (office) RVU3.81 · 100%
- Malpractice RVU0.00 · 0%
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Q4138 compared with similar codes
Office rates for Maine, from the same CMS release.
$117.08–$126.11
Q4137 identifies AmnioExcel or BioDExcel; Q4138 identifies BioDflex DryFlex. Both are area-based product codes, but they represent different products.
Q4139
No office rateAmnio or biodmatrix, inj 1cc
Q4139 is for an injectable amniotic or BioDmatrix product measured by volume. Q4138 is for the dry BioDflex product measured by area.
Compare Q4138 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
2 of 2 payment localities
Rest Of Maine →
Office / nonfacility
$117.08
Facility
Unavailable
Southern Maine →
Office / nonfacility
$126.11
Facility
Unavailable
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Q4138 billing questions
How is Q4138 distinguished from Q4140?
Q4138 identifies BioDflex DryFlex, while Q4140 identifies BioDfence. Both descriptors use a one-centimeter unit, but the product name determines the code.
What unit should be reported?
The code is measured per square centimeter. Document the wound dimensions and the quantity of BioDflex DryFlex used to support the reported units.
Can Q4138 be billed by itself?
No. CMS designates it as an add-on code, so it must be reported with a primary procedure.
Is interpretation included in Q4138?
CMS identifies Q4138 as technical-component-only; a separate code covers interpretation.
How does Q4138 differ from Q4139?
Q4138 is for BioDflex DryFlex measured by area. Q4139 identifies an injectable amniotic or BioDmatrix product measured by volume.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
18,229Q4135,,Mediskin,A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
18,230Q4136,,Ezderm,A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
18,231Q4137,,Amnioexcel biodexcel 1sq cm,A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
18,232Q4138,,"Biodfence dryflex, 1cm",A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
18,233Q4139,,"Amnio or biodmatrix, inj 1cc",C,,0.00,0.00,,0.00,,0.00,0.00,0.00,3,XXX,0.00,0.00,0.00,9,9,9,9,9,9,,33.4009,09,0,99,0.00,0.00,0.00
18,234Q4140,,Biodfence 1cm,A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
18,235Q4141,,"Alloskin ac, 1 cm",A,,0.00,3.81,,3.81,NA,0.00,3.81,3.81,3,ZZZ,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00