Medicare enrollment is one of the most time-sensitive and most commonly mishandled parts of opening a pharmacy. It involves multiple federal systems, specific documentation requirements, and enrollment timelines that can delay your ability to bill Medicare patients by weeks or months if not managed proactively. Here's what independent pharmacy owners need to understand about Medicare Part B, Part D, PECOS, and PTAN assignment.
Part B vs. Part D: Understanding the Difference
Many pharmacy owners use "Medicare" as a catch-all term, but for pharmacy billing purposes, Medicare Part B and Part D are distinct programs with different enrollment processes, different claim submission requirements, and different patient populations.
Medicare Part D
Medicare Part D covers outpatient prescription drugs — the standard retail prescriptions most pharmacies fill daily. Part D is administered through private insurance plans (PDPs — Prescription Drug Plans) and Medicare Advantage plans with drug coverage (MA-PDs). Patients present a Medicare Part D card from their plan (Express Scripts, Humana, CVS Caremark, SilverScript, etc.) and the claim is processed like any other third-party prescription claim.
To bill Medicare Part D, your pharmacy does not directly enroll with CMS for each plan. Instead, you enroll through your PSAO, which has network agreements with the major Part D plan sponsors. This is one of the core reasons PSAO enrollment matters so much — without it, you're effectively uncontracted with Medicare Part D plans, which would mean a significant portion of your patients can't use their Medicare drug coverage at your pharmacy.
Medicare Part B
Medicare Part B covers certain outpatient medical services and products, including Durable Medical Equipment (DME), diabetic supplies, select injectable medications (like B12, certain vaccines administered in the pharmacy), and some immunosuppressant drugs for transplant patients. To bill Medicare Part B, you must enroll directly with CMS as a Medicare supplier — this is a separate enrollment from Part D and requires its own application through PECOS.
PECOS: The Medicare Enrollment System
PECOS (Provider Enrollment, Chain, and Ownership System) is the online system through which CMS processes Medicare enrollment applications. You'll use PECOS for Part B enrollment as a pharmacy supplier. The application requires:
- Your Type 2 (organizational) NPI
- Your state pharmacy permit number
- Business entity documentation (EIN, business formation documents)
- Ownership disclosure information for all individuals with 5%+ ownership
- A surety bond (required for all DMEPOS suppliers — more on this below)
- Your DEA registration certificate (if applying to bill controlled injectable medications)
- Signed certification statement
PECOS enrollment for a new pharmacy supplier is processed by Medicare Administrative Contractors (MACs) — regional entities that process enrollment applications on CMS's behalf. Depending on your region and application volume at the MAC, processing time ranges from 45–90 days from submission of a complete application.
The Surety Bond Requirement
Any pharmacy enrolling as a DMEPOS (Durable Medical Equipment, Prosthetics, Orthotics, and Supplies) supplier under Medicare Part B is required to maintain a surety bond. The current requirement is a $50,000 surety bond per practice location. The bond must name CMS as the obligee, must be from an approved surety company, and must be maintained continuously — if your bond lapses, your Medicare enrollment is terminated.
Surety bonds for pharmacies are not particularly expensive to maintain (typically a few hundred dollars per year depending on your credit profile), but they must be obtained before your Part B enrollment can be approved. This is a step that catches many new pharmacy owners off guard — make sure it's on your opening checklist.
PTAN: Your Medicare Billing Number
Once your Part B enrollment is approved, CMS assigns you a PTAN (Provider Transaction Access Number) — your Medicare billing number. The PTAN, combined with your NPI, is used to identify your pharmacy in Medicare Part B claim submissions. Keep your PTAN documentation safe — it will also be required by some specialty networks and payers who verify Medicare enrollment status as part of their own credentialing.
Medicare Part D Credentialing Through Your PSAO
As mentioned, Part D enrollment typically flows through your PSAO. The PSAO application process requires your pharmacy permit, DEA certificate, NPI, NCPDP number, and a signed participation agreement. Once enrolled with the PSAO, you will be submitted to each Part D plan network the PSAO contracts with. This process can take 30–60 days from PSAO enrollment to being live in each network.
It is important to understand that each Part D plan has its own effective date. Even after your PSAO application is approved, individual plan effective dates may stagger over several weeks. For opening day, you may be in-network with most major Part D plans but not yet with some smaller or regional plans. Your PSAO should provide you a list of your contracted plans and effective dates before you open.
Medicare Compliance: What You Need Before Opening
Beyond enrollment, CMS requires Medicare-enrolled pharmacies to have certain compliance infrastructure in place. For Part B suppliers, this includes:
- A designated Medicare Compliance Officer
- Written Medicare compliance policies and procedures
- An employee compliance training program
- A compliance hotline or reporting mechanism
- Documentation retention practices that meet Medicare standards (minimum 7 years for most records)
These aren't optional — they are conditions of your Medicare enrollment. CMS audits do happen, and the first thing auditors look for is evidence that your compliance program exists and is actively maintained, not just on paper.
Common Medicare Enrollment Mistakes
Starting Too Late
This is the most common mistake. Pharmacy owners think "I'll handle Medicare enrollment once we're closer to opening." But the PECOS application alone takes 45–90 days, and it must be submitted with complete documentation. Start Medicare enrollment as soon as you have your NPI and state permit — ideally 4–5 months before your target opening date.
Mismatched Information
Your NPI, state permit, and PECOS application must have exactly matching business name, address, and ownership information. Any discrepancy triggers a deficiency notice and restarts the review clock. This is a place where having experienced help preparing applications pays for itself immediately.
Skipping the Surety Bond
As noted above, the surety bond is required and must be submitted with the PECOS application. Missing it means an incomplete application. Get the bond before you file.
Forgetting to Update After Changes
Medicare requires you to notify CMS within 30 days of certain changes (address, ownership, PIC changes) and within 90 days of others. Failure to update timely can result in retroactive overpayment liability or enrollment termination. Build Medicare reporting requirements into your operational calendar.
The Timeline Summary
If you start Medicare enrollment concurrently with your state and DEA applications, here's a realistic timeline: NPI is issued within 5 business days. PSAO enrollment + Part D network credentialing: 30–60 days from PSAO application. PECOS Part B enrollment + PTAN issuance: 45–90 days from complete application submission. The goal is to have all Medicare credentialing complete and effective dates confirmed before your opening day — not as a last-minute scramble after you've opened your doors.
We manage complete Medicare enrollment from NPI through PTAN issuance.
Don't let Medicare timing delay your opening. We start the credentialing process on day one and ensure everything is in place before you see your first patient.