HCPCS code S0175 – Flutamide oral capsule billing

Key takeaways

HCPCS Code S0175 describes flutamide, oral, 125 mg, billed at one unit per capsule dispensed.

A 30-day supply at the standard 250 mg three-times-daily dose is 180 units, not 30 or 90.

Traditional Medicare fee-for-service does not pay S-codes, so Medicare patients get flutamide through their Part D drug plan.

Medicaid drug claims for S0175 typically need an 11-digit NDC with the N4 qualifier and the UN unit-of-measure code.

Claims management software that submits CMS-1500/837P claims and tracks prior authorization keeps S0175 claims and their records on one case.

What HCPCS Code S0175 covers

HCPCS Code S0175 covers flutamide dispensed as an oral 125 mg capsule, billed at one unit per capsule.

The code belongs to the HCPCS Level II S-code series, which are temporary national codes used by Medicaid agencies and private payers, not Medicare. S0175 is active for the 2025 and 2026 HCPCS editions.

The code does not cover compounded flutamide preparations, injectable hormone therapies, or flutamide in a strength other than 125 mg. Bill compounded preparations under your payer’s compound drug code. Bill injectable LHRH agonists such as leuprolide under their own J-codes.

Official code descriptor and key attributes

The table below summarizes the core attributes of HCPCS Code S0175 for checking a claim or a payer contract.

Clinical context: Flutamide in prostate cancer treatment

Flutamide (brand name Eulexin) is a non-steroidal antiandrogen that competitively blocks androgen receptors. It is FDA-approved for locally advanced and metastatic prostate cancer, typically alongside an LHRH agonist such as leuprolide to achieve complete androgen blockade.

Standard dosing is 250 mg three times daily, which equals two 125 mg capsules per dose. A patient on the standard regimen therefore takes six capsules per day. A 30-day supply at standard dosing is 180 capsules, so the claim shows 180 units of S0175.

Knowing the regimen prevents the most common unit error on these claims. Counting doses instead of capsules bills 90 units for the same 30-day supply, which is half the correct total.

Supported ICD-10-CM diagnosis codes for HCPCS Code S0175

Medical necessity for S0175 is established by linking the claim to an appropriate ICD-10-CM code. The table below lists the codes most often paired with HCPCS Code S0175, led by C61 for prostate cancer.

Some payer contracts accept off-label diagnoses with S0175, such as benign prostatic hyperplasia or hirsutism. Expect stricter prior authorization and fuller medical necessity documentation for those pairings. Flag any pairing without a prostate cancer code for clinical review before submission.

How to calculate billing units for S0175

S0175 is billed per 125 mg capsule, so one unit equals one capsule dispensed. The quantity billed reflects the capsules dispensed, not the number of doses or the days’ supply, and the gap between those counts is large.

Use this formula: Units billed = total milligrams dispensed divided by 125. The worked examples below show the most common supply lengths and where errors occur.

Always cross-reference the dispensing record against the prescription. A mismatch between the prescription quantity and the billed quantity is one of the top triggers for automated payer edits on drug claims.

NDC reporting requirements with HCPCS Code S0175

Medicaid requires a National Drug Code (NDC) on drug claims, including those submitted with S0175. Many commercial payers have adopted the same requirement. A missing or malformed NDC is among the fastest paths to a denial on these claims.

Report the NDC using the following format on a CMS-1500 or 837P claim:

1. Qualifier: Enter N4 immediately before the NDC number in the designated field (box 24A shading on CMS-1500, or the appropriate 837P loop).
2. NDC format: Use the 11-digit format with no hyphens. Convert the 10-digit NDC on the package to 11 digits by adding a leading zero to the correct segment (labeler, product, or package code).
3. Unit of measure qualifier: Enter UN (each unit) alongside the quantity to show you are reporting individual capsules, not grams or milliliters.
4. Quantity: The NDC quantity must match the units billed for S0175, so the payer can reconcile capsules dispensed against the drug code.

Use the NDC printed on the package you dispensed, not one taken from a reference database. NDCs differ by manufacturer and package size, so a reference NDC can mismatch the dispensed product and draw a flag in a retrospective audit. Record the dispensed NDC at the point of service so it carries through to the claim.

S0175 vs. related HCPCS codes

Coders frequently confuse S0175 with the J-codes for injectable hormone therapy. The distinction matters because the payer pathways, NDC requirements, and claim forms differ substantially.

S-codes and J-codes can appear on the same claim when the practice administers a depot leuprolide injection and also dispenses oral flutamide. Bill S0175 for the flutamide and the matching leuprolide code, such as J9217, for the injection on separate lines. Confirm each descriptor in AAPC’s HCPCS code lookup, then check the payer’s bundling rules before submission.

Payer coverage: Medicare, Medicaid, and commercial plans

HCPCS Code S0175 is not payable by traditional Medicare fee-for-service. CMS does not reimburse S-codes under the Physician Fee Schedule or the outpatient prospective payment system. For Medicare patients, oral flutamide goes through Medicare Part D, the pharmacy benefit run by prescription drug plans. It does not travel on a professional or outpatient facility claim carrying S0175.

The most common routing mistake is submitting S0175 on a CMS-1500 for a Medicare patient. That claim is denied whatever the quality of the documentation.

Reimbursement rates for S0175 are set by individual state Medicaid fee schedules and commercial plan contracts, not by a CMS national payment amount. S0175 does not appear on the Medicare Physician Fee Schedule, so take the rate from the specific payer’s fee schedule or provider portal.

Prior authorization requirements for S0175

Prior authorization for S0175 is not universal, but Medicaid managed care plans and many commercial payers require it for specialty oncology drugs. Good revenue cycle management practice is to check the payer’s drug formulary before dispensing rather than after a denial arrives.

When prior authorization is required, the submission typically needs:

• A diagnosis code confirming prostate cancer (C61 or the code for the metastatic site)
• Prescriber NPI and specialty documentation confirming urology or oncology specialty
• Clinical notes showing the treatment plan and rationale for antiandrogen therapy
• Evidence of appropriate hormonal workup (PSA levels, staging records, or prior treatment history)
• The specific drug name, strength, and quantity requested

If a PA is denied, the payer’s notice or remittance advice will carry a denial reason code. Request the specific clinical criteria the plan used and submit an appeal with additional supporting documentation. Some state Medicaid programs and plans allow retroactive authorization. The window varies by state, so check the plan contract.

Common claim denial reasons for S0175 and how to fix them

Most S0175 denials fall into six categories. Identifying the remittance remark code on the ERA is the fastest way to match the denial to the correct fix. Structured denial management processes at the practice level stop the same error from recurring across multiple claims.

Check the full list of denial codes when the remark code on the ERA does not map clearly to one of the categories above. The CARC and RARC codes on the 835 remittance file identify the denial reason and point to the fix.

Documentation requirements to support S0175 claims

Complete documentation is the strongest defense against both initial denials and retrospective audits. For HCPCS Code S0175, solid medical billing compliance means keeping the following on file for every claim submitted.

• Prescription or medication order with the prescribing provider’s NPI, the drug name and strength, quantity, and days’ supply
• Clinical notes supporting the ICD-10 code billed (pathology report or staging documentation for C61; specialist consultation for metastatic codes)
• NDC from the dispensed package (not a reference database), recorded at the time of dispensing
• Quantity dispensed and days’ supply reconciling to the units billed on the claim
• Prior authorization approval letter where the payer requires it, including the authorization number and validity dates
• Patient consent or program enrollment where the payer mandates patient assistance program verification

Post-payment audits of specialty drug claims often ask for several of these records at once. A practice that files them together at dispensing answers an audit far faster than one rebuilding records months later.

The clean claim requirements for Medicaid and commercial drug claims set out what a payer treats as a complete submission. The PGM Billing HCPCS lookup tool can confirm active code status and descriptor before submission.

How claims management software reduces S0175 errors

Without a connected system, staff calculate S0175 units by hand, copy the NDC from the package, and keep authorization numbers in a separate spreadsheet. Each handoff is a chance for a 180-capsule dispense to leave the practice as a 30-unit claim.

Pabau, the practice management platform we build, keeps the patient’s insurance case and its claims in one place. Its claims management software sends US claims as CMS-1500/837P through Claim.MD, with eligibility checks before submission and ERA remittances posted back.

Prior authorization codes, dates and sessions are tracked on the case, with a warning when one is missing. Your team sees the missing authorization before the S0175 claim goes out, instead of reading it on a remittance weeks later.

Keep drug claims and authorizations together

Pabau’s claims management software sends US claims through Claim.MD and tracks prior authorization codes on the patient’s case. Your billing team spends less time reworking denied drug claims.

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Conclusion

Treat S0175 as a payer-routing decision before it becomes a coding decision. Medicare fee-for-service patients belong in Part D, and only Medicaid or commercial plans that accept S-codes should receive the claim.

Once the payer is right, the claim stands or falls on the capsule count and the NDC from the dispensed package. Capture both at dispensing rather than at billing, and the most common S0175 denials stop repeating.

Book a demo to see how Pabau keeps drug claims and prior authorizations on one patient case.

Continue your research

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