Can Wound Care NPs Bill Medicare Independently? State-by-State Rules
NP independent billing for wound care — full practice authority states, reduced/restricted states, Medicare reimbursement at 85%, and how scope affects your practice model.
Damon Ebanks
Medipyxis
The Short Answer
Yes. Nurse practitioners can bill Medicare independently for wound care services in all 50 states. Medicare does not require physician supervision for NP billing. The NP bills under their own NPI, and Medicare reimburses at 85% of the physician fee schedule rate. This applies to E/M visits, debridement, skin substitute applications, NPWT management, and every other wound care procedure within the NP's clinical scope.
The distinction that trips practices up is the difference between Medicare billing authority and state clinical practice authority. Medicare lets every NP bill independently. Your state determines what the NP is allowed to do clinically without physician involvement.
Medicare Billing Is Federal -- It Does Not Vary by State
Medicare billing rules apply uniformly nationwide. An NP enrolled in Medicare with their own NPI and PTAN (Provider Transaction Access Number) can submit claims independently in any state. The 85% reimbursement rate is the same in Texas, New York, and California. No state can block an NP from billing Medicare independently.
The 85% rate applies to all wound care services: evaluation and management visits (99202-99215), debridement (11042-11047, 97597-97598), skin substitute application (15271-15278), and NPWT (97605-97608). For a typical wound care visit billed as 99213 + 97597, the difference between NP and physician reimbursement is approximately $20-25 per visit.
For practices weighing independent billing at 85% against incident-to billing at 100%, see our detailed breakdown of NP scope and billing rules.
State Scope of Practice: What It Does and Does Not Affect
State scope of practice laws determine what an NP is clinically authorized to do -- not whether they can bill Medicare. Here is how each category works in practice.
Full Practice Authority (FPA) States (~27 states + D.C.)
NPs in FPA states can evaluate, diagnose, treat, and prescribe without any physician involvement. For wound care, this means an NP can operate a wound care practice entirely independently -- assess wounds, order labs, prescribe antibiotics, perform debridement, apply skin substitutes, and manage the full treatment plan. No collaborative agreement is needed.
This is the simplest model for mobile wound care. The NP drives to the facility, treats the patient, documents, and bills under their own NPI. No physician needs to be on-site, on-call, or involved in the care plan.
Reduced Practice States (~12 states)
These states require a collaborative practice agreement (CPA) with a physician. The CPA is a formal written document that defines the scope of the NP's practice and the collaborative relationship. The physician does not need to be on-site or directly supervise patient care. Typically, the collaborative physician reviews a sample of charts periodically.
For wound care billing, the CPA does not change anything on the Medicare side. The NP still bills independently at 85% under their own NPI. The CPA satisfies the state's clinical practice requirement, not a Medicare requirement.
Restricted Practice States (~11 states)
A small number of states require physician supervision for some or all NP clinical activities. The specific requirements vary -- some require the physician to be on-site, others require direct oversight for specific procedures, and others require supervisory review with defined ratios.
Even in restricted states, the NP's Medicare billing remains independent at 85%. The restriction is on clinical authority, not billing authority. However, if the state requires a physician to be on-site during NP clinical activities, the practical effect is that the NP cannot see wound care patients unless the physician is present -- which may make incident-to billing at 100% more practical since the physician presence requirement is already met.
How This Affects Mobile Wound Care Practice Setup
State scope laws have the largest impact on mobile wound care, where clinicians travel to SNFs, assisted living facilities, and patient homes. A physician cannot be physically present at every mobile visit.
In FPA states, mobile wound care NPs operate with complete independence. In reduced practice states, the NP needs a CPA on file but practices independently in the field. In restricted states, the NP may need to limit their mobile practice to services their state allows without on-site physician presence.
Practices operating across state lines -- common for mobile wound care near state borders -- must comply with the scope of practice laws in the state where the service is rendered, not where the practice is headquartered.
When a Collaborative Agreement Is Needed
A collaborative practice agreement is a state-level clinical requirement, not a Medicare billing requirement. You need one when:
- Your state requires it for NP clinical practice (reduced practice states)
- Your state requires it for prescriptive authority, even if not for general practice
- You want to bill incident-to at 100% (the physician must have initiated the care plan and be on-site)
You do not need a CPA to bill Medicare independently at 85% in any state.
For guidance on structuring collaborative agreements for wound care, see our collaborative practice agreement FAQ. For how NP billing authority fits into the broader practice formation picture, see our wound care practice legal structure guide.