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HCPCS Q4399: Wound productMedicare rate & RVUs

Report Q4399 for Summit FX wound product by square centimeter when it is supplied with a primary wound procedure.

CMS RVU26DEffective Oct 1, 2026109 payment localities

Medicare pays $127.26 for Q4399 nationally in the office. Local office rates run $109.31–$183.51.

Medicare rate · Q4399

Wound product

Swap in your local Medicare rate.

Work RVUs
0
Total RVUs
3.81
Global days
ZZZ

National rate · 2026

$127.26

Office setting, before claim adjustments.

See every locality for Q4399 → · Billed by an NP, PA or therapist? →

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

On this page 10 sections
  1. Medicare rate
  2. What Q4399 covers
  3. By payment locality
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Similar codes
  8. Related codes
  9. Billing questions
  10. Sources

What Q4399 covers

Q4399 identifies Summit FX, a wound-care product reported by the square centimeter. It is used when a clinician applies the product to a wound, such as a chronic ulcer, in an outpatient wound clinic or hospital setting. The code represents the product rather than the clinician’s wound assessment or the work of applying it.

Report the quantity in square centimeters and pair Q4399 with the primary procedure, as CMS classifies it as an add-on code. CMS pays it within that procedure’s global period. CMS also designates Q4399 as technical-component-only, with a separate code covering interpretation. Documentation should identify Summit FX, the treated wound, the amount supplied or used, and the primary procedure performed.

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.

Where Q4399 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 payment localities

$109.31 to $183.51

$109.31$146.41$183.51
One dot per payment locality, office / nonfacility. Hover a dot to see the locality; select it to open that rate.

109 of 109 payment localities

Q4399 office and facility rates by payment locality
Payment localityOfficeFacility
Alabama$111.35Unavailable
Alaska*$135.53Unavailable
Arizona$123.31Unavailable
Arkansas$109.31Unavailable
Atlanta$129.29Unavailable
Austin$134.64Unavailable
Bakersfield$139.47Unavailable
Baltimore/Surr. Cntys$136.55Unavailable
Beaumont$115.80Unavailable
Brazoria$126.11Unavailable

Q4399 rates by state

Office rate range in each state. Select a state to see its payment localities.

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

$109.31

$161.49

Color shows the midpoint of each state’s locality range.

View every state and territory as a table
Q4399 office rate range by state
State / territoryOffice rate rangeLocalities
AK$135.531
AL$111.351
AR$109.311
AZ$123.311
CA$139.47–$183.5129
CO$135.401
CT$137.061
DC$149.911
DE$125.731
FL$121.66–$132.473
GA$113.51–$129.292
GU$144.691
HI$144.691
IA$116.441
ID$117.081
IL$116.19–$130.694
IN$117.971
KS$115.041
KY$113.131
LA$112.62–$119.752
MA$134.00–$151.952
MD$128.78–$149.913
ME$117.08–$126.112
MI$116.19–$122.802
MN$130.951
MO$109.70–$121.153
MS$109.571
MT$127.261
NC$118.731
ND$127.261
NE$117.461
NH$132.471
NJ$138.97–$147.622
NM$116.701
NV$127.381
NY$120.89–$151.315
OH$116.191
OK$113.641
OR$126.75–$141.382
PA$116.82–$132.472
PR$128.661
RI$131.461
SC$117.591
SD$127.261
TN$115.681
TX$115.80–$134.648
UT$119.621
VA$125.09–$149.912
VI$128.661
VT$125.981
WA$134.00–$156.142
WI$121.911
WV$110.591
WY$127.261

How the Q4399 rate is calculated

Each of Q4399’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

How the rate is built · Q4399

RVUs × geographic indexes × conversion factor

Swap in your local Medicare rate.

Work 0.00Practice expense 3.81Malpractice 0.00

3.8100 adjusted RVUs×$33.4009 conversion factor=$127.26

All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.

Payment rules and modifiers for Q4399

The CMS indicators that decide how Q4399 is paid alongside other services.

CMS payment indicators · Q4399

Wound product

RuleCMS valueWhat it means
Global periodZZZAdd-on code: falls within the primary procedure’s global period.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)0Not paid without supporting documentation.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical3Technical component only.

Q4399 compared with similar codes

Compare codes

Q4399 vs Q4397 vs Q4398 vs Q4392: national Medicare rates

Swap in your local Medicare rate.

  • Q4399
    Wound product · 0 wRVU
    $127.26
  • Q4397
    · 0 wRVU
    $127.26+$0.00
  • Q4398
    Skin substitute · 0 wRVU
    $127.26+$0.00
  • Q4392
    Skin substitute · 0 wRVU
    $127.26+$0.00

How to choose

Q4397Summit aaa per sq cm
Q4397 identifies Summit AAA; Q4399 identifies Summit FX. Choose the code matching the specific product supplied.
Q4398Skin substitute
Q4398 identifies Summit AC, not Summit FX. These product-specific codes are not interchangeable based only on their shared brand name.
Q4392Skin substitute
Q4392 identifies Grafix Duo, a different product. Use Q4399 only for Summit FX.

Codes related to Q4399

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to Q4399
CodeHow it relatesNational office range
Same family
Q4397Summit aaa per sq cmSummit AAA is a separate product code in the Summit per-square-centimeter series.$109.31–$183.51
Q4398Skin substituteSummit AC is a separate product code in the Summit per-square-centimeter series.$109.31–$183.51
Q4395AcelagraftAcelagraft is another wound-product code reported per square centimeter.$109.31–$183.51
Q4392Skin substituteGrafix Duo is another distinct wound-product code reported per square centimeter.$109.31–$183.51

Q4399 billing questions

When should Q4399 be selected instead of another Summit code?

Use Q4399 when the product furnished is Summit FX. Summit AAA and Summit AC have separate HCPCS codes; select the identifier that matches the product used.

Can Q4399 be billed by itself?

No. CMS classifies it as an add-on code, so it must be billed with a primary procedure.

How is the quantity reported?

The descriptor is per square centimeter. Document the Summit FX area supplied or used and report the corresponding quantity.

How does the global-period rule affect payment?

CMS pays Q4399 within the global period of the primary procedure. It is not paid as a stand-alone service.

What does the technical-component designation mean?

CMS identifies Q4399 as technical-component-only and states that a separate code covers interpretation. The product and its quantity should be documented distinctly from any separately coded interpretation.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Show the CMS file lines behind this rate
RVUs for Q4399PPRRVU2026_Oct_nonQPP.csv, line 18,484 (RVU26D)

Open CMS sourceHow we calculate rates

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