Pharmacy and Specialty Pharmacy Billing Services
Pharmacy billing runs on different rails than most medical billing. Retail and specialty pharmacies mainly submit real-time claims to pharmacy benefit managers (PBMs), using NCPDP formats and National Drug Codes (NDCs) instead of CPT codes. Payment is decided in seconds, but problems often surface months later in audits and reconciliations.
Specialty pharmacy adds more layers. High-cost drugs bring prior authorizations, copay assistance, limited networks, and sometimes claims under the medical benefit instead of the pharmacy benefit. Pharmacy billing teams must track both pathways. Westmont connects pharmacies with vetted billing experts who understand these workflows.
Who this is for
- Independent community pharmacies
- Specialty pharmacies and infusion-focused pharmacies
- Long-term care and institutional pharmacies
- Compounding pharmacies that bill insurance
- Health-system and clinic-owned outpatient pharmacies
- Pharmacies that give vaccines or bill medical-benefit drugs
What gets billed
- Retail prescription fills through PBMs
- Specialty drugs for chronic and complex conditions
- Refills, partial fills, and dose adjustments
- Compounded prescriptions, where the plan allows
- Long-term care facility fills
- Pharmacist-administered vaccines
- Drugs billed under the medical benefit, where the pharmacy is enrolled to do so
- Medication therapy management and other clinical services, where covered
- Copay assistance and manufacturer program claims
- Medicare Part D and Medicaid pharmacy claims
Commonly billed codes
| Code | Type | What it covers |
|---|---|---|
| NDC | Drug identifier | 11-digit National Drug Code that identifies the exact product dispensed |
| NCPDP D.0 | Claim standard | Telecommunication standard used for real-time pharmacy claims |
| DAW 0-9 | NCPDP field | Dispense As Written value that tells the payer if a substitution was made |
| J3490 | HCPCS Level II | Unclassified drug, used when no specific J-code exists |
| JW | Modifier | Reports discarded drug amount on medical-benefit claims |
| JZ | Modifier | Reports that no drug was discarded on certain medical-benefit claims |
| 90471 | CPT | Administration of a single vaccine |
| G0008 | HCPCS Level II | Administration of influenza vaccine, used for Medicare |
| E84.0 | ICD-10-CM | Cystic fibrosis with lung involvement |
| K50.90 | ICD-10-CM | Crohn's disease, unspecified, without complications |
| M06.9 | ICD-10-CM | Rheumatoid arthritis, unspecified |
| G35.D | ICD-10-CM | Multiple sclerosis, unspecified type (more specific MS codes exist) |
| B18.2 | ICD-10-CM | Chronic viral hepatitis C |
Note
Codes are examples for orientation, not a complete list, and do not guarantee coverage or payment. Always check current code sets and payer policy.
Billing challenges in pharmacy
PBM reimbursement and clawbacks. Contracts can change what a pharmacy is paid after the fact through audits, fees, or repricing. Billers read remittances closely and compare payments with the contract.
Prior authorization for specialty drugs. Many specialty drugs need approval before fill. Delays hold up patient starts. Billers track each request, follow up with prescribers, and document the outcome.
Rejected claims at the point of sale. Real-time rejections come from eligibility, refill timing, quantity limits, or coverage issues. Billers sort reject codes by cause and fix repeat problems at the source.
Pharmacy versus medical benefit. Some drugs can be billed under either benefit, and each uses different codes and rules. Billers check which route the payer expects and whether the pharmacy is set up to bill it.
PBM audits. Auditors may recoup payment for missing signatures, quantity mismatches, or incomplete records. Billers help keep prescription and delivery documentation audit-ready.
Copay assistance and accumulators. Manufacturer assistance and plan programs can change what the patient owes. Billers track assistance funds and patient balances so the pharmacy collects correctly.
Dispensing and NDC accuracy. The NDC billed must match the product dispensed. Billers watch package size, unit, and quantity details that commonly cause rejections or audit findings.
Medicare Part D and Medicaid differences. Each program has its own formulary, rules, and timelines, and they change from year to year. Billers keep current payer sheets and check updates.
How Westmont can help
- Matches your pharmacy with vetted billing experts experienced in PBM, specialty, and medical-benefit billing
- Connects you with end-to-end revenue cycle support, from claim review through reconciliation of payments
- Supports reject management, denial appeals, and audit response
- Helps you find experts who assist with payer enrollment and network credentialing
- Lets you compare billing options as your drug mix and payer contracts change
Frequently asked questions
How is pharmacy billing different from medical billing?
Pharmacy billing uses NDCs and NCPDP claim standards, and most claims are adjudicated instantly through a PBM. Medical billing relies on CPT, HCPCS, and ICD-10 codes and is submitted after the service. Pharmacies that bill drugs under the medical benefit have to handle both systems.
What is specialty pharmacy billing?
Specialty pharmacy billing covers high-cost drugs for complex or chronic conditions. These claims often need prior authorization, clinical documentation, limited-network access, and manual follow-up. Some specialty drugs are billed to the medical benefit, which uses different codes. Careful tracking from referral to payment is important.
Why are pharmacy claims rejected?
Common causes include inactive coverage, refill-too-soon edits, quantity limits, missing prior authorization, and incorrect prescriber or NDC data. Rejects return in real time with a code that explains the issue. A biller sorts these by cause so the pharmacy can fix the root problem rather than each claim.
What are DIR fees and why do they matter?
Direct and indirect remuneration (DIR) fees were adjustments applied to pharmacy payments in Medicare Part D after the sale. CMS has changed how these amounts are handled in recent years. Check current Part D rules and your PBM contracts to see how pricing and adjustments apply to you today.
Can a pharmacy bill under the medical benefit?
Sometimes. Certain drugs, such as some infusion or injectable therapies, may be covered under a patient's medical benefit rather than the pharmacy benefit. This depends on the payer, the drug, and the pharmacy's enrollment. Confirm each payer's policy before you bill this way.
Related billing services
See what simpler billing looks like
Tell us about your practice and we will connect you with vetted billing experts. Contact Westmont for a quote.
Contact Westmont