Aberrant NDC report tool
The short answer
PharmaFix normalizes supported NDC formats and compares them with the bundled reference set used by the analyzer. It then estimates matched paid-dollar and claim-count shares for the selected report month.
How NDC matching works
NDCs are matched in canonical 11-digit form. A 10-digit NDC is first padded to 11 by its segment layout, and unhyphenated codes are checked against common variants, so a match is found whether your export writes the NDC with or without hyphens.
What the tool reports
- The share of your paid dollars tied to aberrant NDCs (the dollar test).
- The share of your claims tied to aberrant NDCs (the claim-count test).
- A day-by-day view so you can see when aberrant activity accumulated.
- The size of the aberrant list your file was checked against.
Why NDC matching is easy to get wrong
The same product can appear as 00310-0737-30 in one export and 0310073730 in another. A naive text comparison misses those matches and understates your aberrant share. Matching in canonical 11-digit form, with layout-aware padding for 10-digit codes, keeps the count honest either way.
How different NDC formats are matched
| NDC as exported | Layout | Canonical 11-digit form |
|---|---|---|
| 00310-0737-30 | Already 11 digits (5-4-2) | 00310073730 |
| 0310-0737-30 | 10 digits, 4-4-2 | 00310073730 (labeler padded) |
| 31007-373-0 | 10 digits, 5-3-2 style | Padded by segment layout |
| 0310073730 | 10 digits, no hyphens | All common variants checked; a match on any counts |
Version and effective dates
Last reviewed September 28, 2026. The analyzer applies 34 additions on or after August 1, 2026, 46 more on or after September 1, and 40 more on or after November 1. An August report uses 1,736 effective NDCs; a September or October report uses 1,782; a November report uses 1,822. Other entries remain dependent on the bundled source history, so confirm current payer documents.
Frequently asked questions
What is an aberrant NDC?
It is a product, identified by its NDC, on a defined aberrant-product list that networks use when they look at dispensing mix. Being on the list is about billing patterns and network review, not a clinical judgment about the product.
Do I need to format NDCs a certain way?
No. PharmaFix normalizes NDCs to 11-digit form and checks common variants, so hyphenated and unhyphenated codes both match.
Estimate your report's position against the 25% reference line
Upload only an authorized PrimeRx or Caremark report without direct patient identifiers. PharmaFix calculates report-based rates and is designed not to retain report rows or results.