Nurse Practitioner & PA Credentialing Guide
Insurance credentialing for nurse practitioners and physician assistants follows the same skeleton as physician credentialing — CAQH, PECOS, payer committees — with one extra layer: your state's practice-authority rules decide which supervision or collaboration documents every payer will demand. Start with your state, then work the timeline.
FIG · 01What your state makes you attach
AANP map 05/2026 · AAPA 2026Full practice
27 states + DCNo agreement. Payers may still ask you to confirm scope.
Reduced practice
12 statesCollaborative agreement, usually uploaded with the application.
Restricted practice
11 statesSupervision/delegation agreement plus the supervising MD's details.
Legislatures change these lists every session. Confirm against your board of nursing or medicine before you submit.
FIG · 02The NP/PA Credentialing Timeline
Plan on 90 to 180 days from a complete packet to a payer effective date, and start before the offer letter is signed. The steps below assume you are joining a group that already holds payer contracts. Solo practices add the group enrollment (855B) and a contract negotiation on top. The general version lives in our provider credentialing guide.
Wk 0
License, certification, NPI
State APRN or PA license in hand, national certification active, Type 1 NPI issued (free, 1–10 days).
Wk 0–2
Practice agreement signed
Collaborative or supervision agreement executed and filed with the board where the state requires filing.
Wk 1–3
CAQH profile complete + attested
Every gap explained, malpractice face sheet uploaded, each payer authorized to view.
Wk 2–4
Medicare 855I in PECOS
Enroll and reassign to the group in one filing. Effective date = filing date, so file before the first Medicare visit.
Wk 3–6
Medicaid + commercial applications
State Medicaid portal, then each commercial plan. Most pull from CAQH; a few still want their own form.
Wk 6–16
Verification and committee
Primary-source checks, committee review. Follow up every 7–14 days; unanswered requests quietly stall.
Wk 12–24
Contracting and effective date
Credentialed is not contracted. Confirm the effective date in writing before scheduling insured patients.
What the delay costs: an NP or PA seeing 15 patients a day generates roughly $9,000+ per month of billable work. Every month spent uncredentialed is either written off or billed under someone else's NPI, which is its own compliance problem (see incident-to below).
Collaborative and Supervision Agreements: What Payers Ask For
This is the document that separates NP/PA credentialing from physician credentialing. Payers verify that you are practicing legally in your state, so what they ask for tracks your state's practice-authority category (the map above). Get the agreement signed before you submit anything — a missing or expired agreement is one of the most common reasons an application gets kicked back for “additional information” and loses a month.
| Situation | State document | What the payer wants |
|---|---|---|
| NP — full practice state | None required by the state | Attestation of independent scope; some plans still request a collaboration letter out of habit — push back with the state citation |
| NP — reduced practice state | Collaborative practice agreement | Executed agreement, collaborating physician's name and NPI, sometimes proof of board filing |
| NP — restricted practice state | Supervision / delegation agreement | Executed agreement, supervising physician's license and NPI, chart-review or protocol terms where state law sets them |
| PA — agreement state | Supervision or collaboration agreement | Executed agreement plus the physician's details; ratio compliance where the state caps PAs per physician |
| PA — no-agreement state | None required by the state | Scope attestation; hospitals and some plans still impose their own collaboration requirement by policy |
What a payer-ready agreement contains
Both parties' names, licenses, and NPIs; the scope of services delegated or collaborated on; prescriptive authority terms (including controlled substances where applicable); the chart-review or consultation cadence the state requires; effective date and signatures. Keep the executed copy where your credentialing file lives — you will re-upload it at every revalidation.
If your collaborating physician changes, that is a reportable change to your board, your Medicare enrollment (30-day window for certain changes), and every commercial payer file. Practices routinely miss this and only discover it at revalidation.
NPI Type 1 vs. Type 2, and Your CAQH Profile
Every NP and PA needs an individual Type 1 NPI — it identifies you as the rendering provider on every claim, no matter who gets paid. Whether you also need a Type 2 depends on how the practice is structured.
Type 1 — Individual
- Issued to you personally; follows you between jobs
- Required for every NP and PA — Medicare has required PAs to bill under their own NPI since 2022
- Goes in the rendering-provider field on claims
- Free at NPPES; typically issued in 1–10 days
Type 2 — Organization
- Issued to the legal entity (group, clinic, your own PLLC)
- Goes in the billing-provider field; payment flows here
- Employed by a group? The group already has one — you don't apply
- Opening your own practice, even solo? Get a Type 2 for the entity and keep your Type 1 as rendering
CAQH: build it once, maintain it forever
Nearly every commercial payer pulls your application data from CAQH instead of asking you directly. The profile has to be complete — every employment gap over a few months explained, malpractice face sheet uploaded, each payer explicitly authorized — and re-attested every 120 days or payers see a stale-profile flag and your applications stall. NPs should list their certification body (AANP, ANCC, PNCB, NCC) and certification number exactly as issued; PAs list NCCPA. Name mismatches between your license, certification, and CAQH are a top rejection cause. The full field-by-field walkthrough is in our CAQH credentialing guide.
Medicare Enrollment: 855I vs. 855B (and the Retired 855R)
Medicare enrollment runs through PECOS and is separate from commercial credentialing — no CAQH, no committee, just the application and primary-source checks. Individual NPs and PAs pay no application fee (that fee is for institutional providers).
| Form | Who files it | What it does |
|---|---|---|
| CMS-855I | You, the individual NP or PA | Enrolls you in Medicare and — since late 2023 — also carries the reassignment of your payments to the group's TIN. One filing does both. |
| CMS-855B | The group practice or clinic | Enrolls the organization itself as a billing entity. Employed NPs/PAs never file this; a practice owner files it once for the entity. |
| CMS-855R | Retired | The old standalone reassignment form was discontinued Oct 31, 2023. If a checklist still tells you to file an 855R, the checklist is stale — reassignment now lives inside the 855I. |
Who qualifies to enroll
Medicare sets its own professional bar on top of your state license. NPs enrolling for the first time need national certification from a recognized body plus a master's or DNP (42 CFR § 410.75). PAs need graduation from an accredited PA program or NCCPA certification, plus state licensure (42 CFR § 410.74). Since January 1, 2022, PAs can enroll, bill, and be paid directly — before that, only a PA's employer could receive payment.
Effective-date math: your billing privileges start at the later of the date your (ultimately approved) application was filed or the date you started furnishing services at the location (42 CFR § 424.520). You may bill retrospectively for up to 30 days before that effective date when circumstances prevented earlier enrollment (§ 424.521). File in PECOS the week the license clears — not the week you start seeing patients.
Medicaid is a separate enrollment in every state — its own portal, its own forms, often its own fingerprinting rules. If the practice sees Medicaid patients, run it in parallel with Medicare, and check whether your state's managed-care plans require yet another application on top. Track all of it in a work plan so nothing sits unwatched.
Incident-To Billing: Why Credentialing Still Matters at 100%
Medicare pays NPs and PAs 85% of the physician fee schedule when they bill under their own NPI. “Incident-to” billing lets the practice bill certain NP/PA office visits under the physician's NPI at 100% — a 15-point swing that tempts practices to skip credentialing the NP/PA at all. That is a mistake: incident-to only fits a narrow pattern, and every visit outside it needs your own enrolled NPI.
Your NPI
85%
of the physician fee schedule — any patient, any problem, any visit type you are licensed for
Incident-to (physician's NPI)
100%
only when every incident-to condition below is met, in the office setting
Every box must be checked
- Established patient with an established problem — the physician saw the patient first and set the plan of care
- You are executing that plan, not evaluating a new complaint
- Service happens in the office (place of service 11), not hospital or facility settings
- A physician in the group provides direct supervision — since Jan 1, 2026, real-time audio/video availability counts; audio-only does not
- The supervising physician stays involved — documentation should show their ongoing role in the patient's care
New patient or new problem? Incident-to is off the table. The visit bills under whoever performed it — your NPI, at 85%. If you are not enrolled, that revenue is unbillable, and billing it under the physician anyway is a false claim. Incident-to misuse is a recurring OIG audit target and shows up alongside Stark and anti-kickback issues in enforcement actions. Commercial payers each have their own rules — some pay NPs/PAs at 100% under their own NPI, some prohibit incident-to entirely. Get each payer's policy in writing and fold it into your internal audit routine.
NP/PA Document Checklist
Assemble everything before the first application goes out — payers process complete packets and shelve incomplete ones. Check items off as you gather them. For a printable version that covers the whole practice, use the credentialing checklist tool.
Packet readiness
0/18
Identity & licensure
Practice authority
Education & history
Billing & coverage
6 Mistakes That Add Months
Most NP/PA credentialing delays are self-inflicted. These are the ones credentialing teams see over and over — the same category of unforced errors that plague CAQH profiles generally.
Waiting for the start date to begin credentialing
Fix: Start the day the offer is signed. Licensure, CAQH, and PECOS can all run before day one — commercial effective dates rarely backdate, so every early week is billable revenue.
Filing an 855R because an old checklist said to
Fix: The 855R was retired in October 2023. Reassignment rides on the 855I now — a stale filing gets returned and costs the queue position.
Submitting before the collaborative agreement is executed
Fix: In reduced and restricted states the payer will request it, park your file, and wait. Sign it first, then apply.
Certification body mismatch across documents
Fix: AANP vs. ANCC matters. If CAQH says one and your primary source says the other, verification fails silently. Match every field to the certificate.
Letting CAQH lapse mid-application
Fix: The 120-day re-attestation clock keeps running while payers review. A lapse mid-review flags your profile as stale. Calendar it.
Billing everything incident-to while credentialing is pending
Fix: New patients and new problems never qualify. Either hold those claims until your enrollment's effective date covers them, or expect refund demands later.
Quick Reference: NP/PA Credentialing
Know your state category first
Full practice: no agreement. Reduced: collaborative agreement. Restricted: supervision agreement. PAs: 9 states need no named physician; the rest do.
One NPI, one CAQH, one 855I
Type 1 NPI from NPPES, CAQH complete and re-attested every 120 days, 855I in PECOS (enrollment + reassignment together — the 855R is retired).
Timeline: 90–180 days
Medicare is usually fastest. Medicaid and each commercial plan run in parallel. Follow up every 7–14 days.
85% vs. 100%
Own NPI pays 85% of the fee schedule but works for every visit. Incident-to pays 100% only for established patients on a physician's plan of care.
Related Tools & Guides
Provider Credentialing Guide
The full payer credentialing process for any provider type.
CAQH Credentialing Guide
Field-by-field walkthrough of the profile every payer pulls from.
Credentialing Checklist
Printable document checklist for new-provider credentialing.
Best Credentialing Software
Platforms that track applications, expirables, and re-attestations.
Healthcare Onboarding Checklist
Everything else a new NP or PA hire needs beyond credentialing.