NDC codes

FDA NDC Directory
Product NDC (as listed)16571-261Labeler and product segments. Claims need a package NDC.
Product NDC at billing width16571-0261Add the package segment from the table below.
Package NDCs as listed with the FDA, and the 11-digit 5-4-2 form used on claims. The highlighted digit is the added leading zero.
Package NDC11-digit (billing)PackageCopy
16571-261-0116571026101100 TABLET in 1 CONTAINER (16571-261-01)Marketed from Nov 4, 2025
16571-261-3016571026130300 TABLET in 1 CONTAINER (16571-261-30)Marketed from Nov 4, 2025

How the 11-digit form is made: The product segment has 3 digits, so one leading zero is added to it (5-3-2 → 5-4-2). Formatting the NDC does not by itself make it billable — the product, package and quantity must match what was dispensed or administered, and payer rules apply. Conversion rules

Product information

Brand name (proprietary)
Sulfasalazine
Generic name (nonproprietary)
sulfasalazine
Active ingredients
Sulfasalazine — 500 mg/1
Dosage form
Tablet
Route
Oral
Product type
Prescription drug
Marketing category
ANDA — Abbreviated New Drug Application (generic)Application ANDA 219046
Marketing start
Listing expires
Other FDA classes
Aminosalicylic Acids (Chemical structure)
Identifiers
Product ID 16571-261_4b43540c-2b08-44cb-81b8-4308dea2c141SPL ID 4b43540c-2b08-44cb-81b8-4308dea2c141SPL set ID 3254432e-87a4-4af0-afd1-d9e6f1b0efd4RxCUI 198232UNII 3XC8GUZ6CB
Pharmacologic class
Aminosalicylate

Billing references

What Med-Code can say about coding this product, and where each statement comes from. Nothing here is inferred from the name alone.

HCPCS codeNo match

No HCPCS code in Med-Code's directory. Oral products like this are usually dispensed by a pharmacy and billed by NDC.

NDC on a medical claim

N416571026101 followed by a unit qualifier and the quantity

Package 16571-0261-01. Unit qualifiers: F2 (international unit), GR (gram), ME (milligram), ML (milliliter), UN (unit (each)). The qualifier and quantity depend on what was given. About the N4 qualifier

Product label

Current FDA label (SPL), effective .

Indications (excerpt from the label)

INDICATIONS AND USAGE Sulfasalazine tablets are indicated: a) in the treatment of mild to moderate ulcerative colitis, and as adjunctive therapy in severe ulcerative colitis; and b) for the prolongation of the remission period between acute attacks of ulcerative colitis.

Excerpt only. Read the full label for complete information.

Full label on DailyMed (opens in a new tab)

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