A National Drug Code, or NDC, is FDA's three-part number identifying a drug's labeler, product and package. FDA is the Food and Drug Administration. The labeler is the business named on the product listing, such as a manufacturer or repackager. If you're asking what is an NDC number, think of it as a product identifier on medicine packaging.

It doesn't identify your individual prescription or prove what's inside a particular package. Those questions need more than a number.

What is an NDC number in FDA's definition?

21 CFR 207.33, the federal drug-listing regulation, says the code identifies the labeler, product, and package size and type. A listing is a company's report of a drug marketed in the United States.

Part of the code What it identifies
Labeler code The manufacturer, repackager, relabeler or private-label distributor.
Product code The particular drug, including its strength and dosage form—the physical form of the medicine.
Package code The package size and type.

As of October 1, 2026, the day this article was written, FDA's NDC Directory page, marked “Content current as of: 03/04/2026,” states: “Assignment of an NDC number does not in any way denote FDA approval of the product.”

The directory contains company-submitted information. Inclusion doesn't mean FDA has verified that information. The listing tells you which product the company reported; it isn't a test result for the medicine in hand.

Why medicines have product codes

Drug names alone leave room for confusion. One ingredient can appear under different brands, in different strengths and in different packages. Pharmacies and insurers need to distinguish those products in their records.

A 2015 study by Peters and Bodenreider in AMIA Annual Symposium Proceedings examined older medication records. It found that historical code information helped connect obsolete NDCs to drugs still represented in current databases. A packaging or supplier change can matter even when the ingredient name stays familiar.

That distinction matters for tirzepatide, too. Through Promise, tirzepatide and semaglutide are dispensed as compounded medications, which are different from an FDA-approved product: the formulations offered here are not FDA-approved. Compounding means preparing a medicine by combining or altering ingredients.

A licensed provider may still prescribe — that decision is between you and your doctor.

Where the NDC appears on a pen carton

On a branded pen carton, the NDC usually sits beside the drug name or other package information. The pen and outer carton can have different package codes because they describe different packaging levels.

As of October 1, 2026, the day this article was written, Ozempic's DailyMed label, with prescribing information marked “Revised: 5/2026,” shows the carton code 0169-4130-13. Here, 0169 is the labeler segment, 4130 identifies the product, and 13 identifies the package.

An NDC code lookup starts with the number on the actual package. FDA's directory search has separate finished, unfinished and compounded-product searches. “Unfinished” means an ingredient before it becomes a finished medicine. DailyMed also accepts NDC searches and displays submitted labels and package information.

The useful comparison includes the drug name, strength, labeler and package description. A matching number alone can't authenticate the carton or its contents.

Why labels use 10 digits and billing uses 11

Today's familiar package codes have 10 digits in three layouts: 4-4-2, 5-3-2 or 5-4-1. Billing commonly uses an 11-digit, 5-4-2 version, with a leading zero added to the shorter segment.

For example, a four-digit labeler segment becomes five digits in the billing version. The extra zero changes how the code is written; it doesn't change the medicine. FDA explains this conversion in its NDC format final rule.

As of October 1, 2026, the day this article was written, FDA's format page, marked “Content current as of: 07/08/2026,” explains the coming 12-digit, 6-4-2 format. The final rule was published March 5, 2026, and takes effect March 7, 2033. That rule doesn't itself change the separate 11-digit billing standard.

Does compounded medication have an NDC?

Some compounded products have an NDC; others don't. The pharmacy's regulatory route explains why.

For the traditional 503A route—compounding for an identified patient—qualifying pharmacies are exempt from federal registration and drug listing. 21 CFR 207.13(a) ties that exemption to lawful pharmacy practice, valid prescriptions and regular retail dispensing activities. It doesn't remove other obligations. A patient-specific compounded prescription therefore needn't have an NDC listing simply because it was dispensed.

A 503B outsourcing facility follows a separate reporting system. FDA's December 2016 reporting guidance requires product reports at initial registration and twice yearly, in June and December. Those reports include the final product's NDC “if assigned.” Choosing a code and reporting products are separate matters.

For a compounded semaglutide prescription, a missing NDC is not a quality verdict either way. The actual preparation, pharmacy and batch records still matter. Compounded medicines have labels; for outsourcing-facility (503B) products, section 503B(a)(10) specifically requires a lot number and an NDC if available.

Three mistakes an NDC can't resolve

Treating a listing as product endorsement. The code identifies a reported product. It doesn't establish its review status, quality or suitability for one person.

Reading the NDC as a lot number. A lot number identifies a production batch; an NDC identifies the product and package. Authenticity checks connect both with the source and other package details. Our counterfeit Ozempic guide explains the specific checks.

Assuming a code guarantees insurance coverage. FDA expressly says directory inclusion doesn't establish coverage or reimbursement eligibility. A formulary is the insurer's covered-drug list, and its clinical conditions still apply. Tirzepatide insurance coverage explains that separate question.

Even electronic records can disagree. A 2016 study by Dhavle and colleagues in JAMIA found occasional mismatches between NDC and RxNorm identifiers. RxNorm is a standardized system for naming medicines. The code and the written product details both deserve attention when a pharmacy investigates a discrepancy.

For prescribed compounded tirzepatide, the useful record identifies the preparation actually dispensed. A brand product's code doesn't identify a different compounded formulation.

A bulk drug substance is the active ingredient before it becomes finished medicine. A certificate of analysis reports testing for a particular batch. Neither document is an NDC listing.

Off-label use describes how a reviewed drug product is prescribed outside its official prescribing information. It describes a use, while the NDC identifies a product and package.

At Promise, a licensed provider reviews every request, and not everyone qualifies. A number helps identify the medication; the visit considers whether that medication fits the person.