Wound Care Collaborative Practice Agreement: What NPs Need to Know
Collaborative practice agreements for wound care NPs — which states require them, what they must include, physician supervision models, and how they affect your billing.
Damon Ebanks
Medipyxis
What Is a Collaborative Practice Agreement in Wound Care?
A Collaborative Practice Agreement (CPA) is a formal written document that defines the working relationship between a nurse practitioner and a supervising or collaborating physician. It establishes the NP's scope of practice, the physician's oversight responsibilities, and the protocols governing clinical decisions. In wound care, the CPA dictates what procedures the NP can perform independently, which require physician consultation, and how chart reviews are conducted.
CPAs are legally binding documents. An NP practicing wound care without a required CPA -- or operating outside the scope it defines -- risks license discipline, malpractice exposure, and payer recoupment of claims.
Which states require a CPA for wound care NPs?
State requirements fall into three categories based on practice authority:
Full practice states (27 states plus DC as of 2026) allow NPs to evaluate, diagnose, order tests, and prescribe without physician oversight. No CPA is required. Examples include Arizona, Colorado, Montana, Oregon, and Washington.
Reduced practice states (12 states) require a collaborative agreement but not direct supervision. The physician does not need to be on-site. States include Illinois, Kansas, Ohio, and Pennsylvania.
Restricted practice states (11 states) require both a CPA and direct physician supervision with defined oversight ratios. States include California, Florida, Georgia, Missouri, and Texas. In Texas, the supervising physician must be available within a defined geographic radius, and chart review ratios are codified in statute.
NPs operating mobile wound care practices across state lines must maintain a CPA for each restricted or reduced practice state where services are rendered -- not just where the practice is headquartered. For guidance on structuring your practice entity across states, see our legal structure guide.
What must a wound care CPA include?
A wound care CPA typically specifies:
- Scope of practice. Which procedures the NP performs independently -- wound assessment, debridement (selective and sharp), skin substitute application, NPWT initiation, and prescribing wound-related medications.
- Consultation protocols. Clinical scenarios requiring physician input -- wounds with exposed tendon or bone, patients with uncontrolled comorbidities affecting healing, or wounds failing to progress after 30 days of treatment.
- Chart review requirements. Frequency and method of physician chart review. State minimums vary from 10% of charts monthly (Illinois) to 100% within 30 days (some Texas delegation agreements). The CPA should specify the review cadence, documentation method, and how deficiencies are addressed.
- Prescriptive authority. Which medications and controlled substances the NP can prescribe, including topical antimicrobials, oral antibiotics for wound infections, and pain management protocols.
- Supervision model. Whether oversight is prospective (physician approves treatment plans before execution), concurrent (physician available for real-time consultation), or retrospective (chart review after the fact).
How does a CPA affect wound care billing?
The CPA determines whether the NP bills independently or under the "incident-to" billing model.
Independent billing means the NP bills under their own NPI. Medicare reimburses NP services at 85% of the physician fee schedule. The NP must be credentialed and enrolled with each payer separately.
Incident-to billing allows the NP's services to be billed under the collaborating physician's NPI at 100% of the physician fee schedule -- but only when strict requirements are met. The physician must have established the patient's plan of care, the physician must be physically present in the office suite (not just available by phone), and the service must be part of a physician-initiated treatment plan. Mobile wound care visits at SNFs or patient homes almost never qualify for incident-to billing because the physician is rarely on-site.
Practices that bill incident-to without meeting all requirements face full recoupment on audit. The CPA alone does not authorize incident-to billing -- the physical presence and plan-of-care requirements must be met for each visit.
For the full credentialing process timeline and requirements, see our credentialing guide.
How do I find a collaborating physician for wound care?
Start with physicians who already treat wound care patients -- vascular surgeons, podiatrists with MD/DO credentials, general surgeons, and primary care physicians with SNF panels. Hospital wound care centers are another source; their medical directors often provide collaboration agreements as part of community outreach.
State medical associations and NP professional organizations maintain collaborating physician registries. Online matching services like DocSpot connect NPs with physicians willing to collaborate remotely in states that allow it.
What does a collaborating physician cost?
Collaborating physician fees typically range from $500 to $2,000 per month, depending on chart review volume, state requirements, and specialty. Physicians in restricted practice states with mandatory on-site supervision charge more due to their time commitment. Some physicians charge per chart review ($25-$75 per chart) rather than a flat monthly rate.
The cost is a fixed overhead item. For a wound care NP generating $30,000-$50,000 in monthly collections, a $1,000/month collaboration fee represents 2-3% of revenue -- a manageable cost that should be factored into the practice's financial model from day one.