What is NDC 51991-620?

51991-620 is the product NDC for Anastrozole, Anastrozole 1 mg/1 tablet, listed with the FDA by Breckenridge Pharmaceutical, Inc.. It has 3 package NDCs, shown above in 10- and 11-digit form.

Breckenridge Pharmaceutical, Inc., NDC labeler code 51991. The labeler is the company responsible for the label; it may be the manufacturer, a repackager or a distributor.

What other NDCs exist for Anastrozole?

38 other product NDCs are listed under this name.

Is there a related HCPCS / J-code?

Not in Med-Code's curated HCPCS directory.

Anastrozole NDC 51991-620 | National Drug Code

NDC codes

FDA NDC Directory

Product NDC (as listed)51991-620Labeler and product segments. Claims need a package NDC.

Product NDC at billing width51991-0620Add 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 NDC	11-digit (billing)	Package
51991-620-10	5199106201051991062010	1000 TABLET in 1 BOTTLE (51991-620-10)Marketed from Jun 28, 2010
51991-620-33	5199106203351991062033	30 TABLET in 1 BOTTLE (51991-620-33)Marketed from Jun 28, 2010
51991-620-90	5199106209051991062090	90 TABLET in 1 BOTTLE (51991-620-90)Marketed from Apr 1, 2023

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): Anastrozole
Generic name (nonproprietary): anastrozole
Active ingredients: Anastrozole — 1 mg/1
Dosage form: Tablet
Route: Oral
Labeler: Breckenridge Pharmaceutical, Inc.NDC labeler code 51991
Product type: Prescription drug
Marketing category: ANDA — Abbreviated New Drug Application (generic)Application ANDA 079220
Marketing start: Jun 28, 2010
Listing expires: Dec 31, 2027
Other FDA classes: Aromatase Inhibitors (Mechanism)
Identifiers: Product ID 51991-620_c014dfc0-811e-46bc-bcb7-3da430074a56SPL ID c014dfc0-811e-46bc-bcb7-3da430074a56SPL set ID ca9d4aff-ffdf-4a46-ad20-e47e5886a19eRxCUI 199224UNII 2Z07MYW1AZUPC 0351991620907
Pharmacologic class: Aromatase Inhibitor

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

N451991062010 followed by a unit qualifier and the quantity

Package 51991-0620-10. 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 Aug 18, 2026.

Indications (excerpt from the label)

Anastrozole tablets are an aromatase inhibitor indicated for: Adjuvant treatment of postmenopausal women with hormone receptor-positive early breast cancer ( 1.1 ) First-line treatment of postmenopausal women with hormone receptor-positive or hormone receptor unknown locally advanced or metastatic breast cancer ( 1.2 ) Treatment of advanced breast cancer in postmenopausal women with disease progression following tamoxifen therapy. Patients with ER-negative disease and patients who did not respond to previous tamoxifen therapy rarely responded to anastrozole tablets ( 1.3 ) 1.1 Adjuvant Treatment Anastrozole tablets are indicated for adjuvant treatment of postmenopausal women with hormone rec…

Excerpt only. Read the full label for complete information.

Full label on DailyMed (opens in a new tab)

About NDC 51991-620

What is NDC 51991-620?: 51991-620 is the product NDC for Anastrozole, Anastrozole 1 mg/1 tablet, listed with the FDA by Breckenridge Pharmaceutical, Inc.. It has 3 package NDCs, shown above in 10- and 11-digit form.
What drug is associated with this NDC?: Anastrozole.
What is the active ingredient?: Anastrozole.
Who is the labeler?: Breckenridge Pharmaceutical, Inc., NDC labeler code 51991. The labeler is the company responsible for the label; it may be the manufacturer, a repackager or a distributor.
What other NDCs exist for Anastrozole?: 38 other product NDCs are listed under this name. See all Anastrozole NDCs.
Is there a related HCPCS / J-code?: Not in Med-Code's curated HCPCS directory. See Billing references above.

Other finished products listed under the same name: strengths, forms and labelers.

Other Anastrozole NDCs
Product	Strength	Form · route	Labeler	Product NDC	Package NDCs (11-digit)
Anastrozole	Anastrozole 1 mg/1	TabletOral	Direct_Rx	72189-682	72189-0682-30
Anastrozole	Anastrozole 1 mg/1	Tablet, Film coatedOral	PD-Rx Pharmaceuticals, Inc.	72789-575	72789-0575-1572789-0575-30
Anastrozoleanastrozole tablets	Anastrozole 1 mg/1	TabletOral	Upsher-Smith Laboratories, LLC	24979-725	24979-0725-0624979-0725-07
Anastrozole	Anastrozole 1 mg/1	TabletOral	AvKARE	42291-016	42291-0016-3042291-0016-90
Anastrozole	Anastrozole 1 mg/1	TabletOral	Direct_Rx	72189-415	72189-0415-30
Anastrozole	Anastrozole 1 mg/1	Tablet, Film coatedOral	Aurobindo Pharma Limited	59651-236	59651-0236-3059651-0236-90
Anastrozole	Anastrozole 1 mg/1	Tablet, Film coatedOral	AvKARE	42291-085	42291-0085-3042291-0085-90
Anastrozole	Anastrozole 1 mg/1	TabletOral	AvPAK	50268-075	50268-0075-15
Anastrozoleanastrozole tablets	Anastrozole 1 mg/1	TabletOral	Avet Pharmaceuticals Inc	23155-857	23155-0857-0323155-0857-0523155-0857-09
Anastrozole	Anastrozole 1 mg/1	TabletOral	Chartwell RX, LLC	62135-490	62135-0490-3062135-0490-90

All 39 Anastrozole NDCs

Other NDCs under ANDA 079220

Products listed under the same FDA application: other strengths and forms, and repackagers who relabel the same product.

FDA NDC Directory listings under ANDA 079220
Product	Strength	Form · route	Labeler	Product NDC
Anastrozole	Anastrozole 1 mg/1	TabletOral	AvKARE	42291-016
Anastrozole	Anastrozole 1 mg/1	TabletOral	PD-Rx Pharmaceuticals, Inc.	43063-383
Anastrozole	Anastrozole 1 mg/1	TabletOral	A-S Medication Solutions	50090-5002
Anastrozole	Anastrozole 1 mg/1	TabletOral	AvPAK	50268-075
Anastrozole	Anastrozole 1 mg/1	TabletOral	Natco Pharma Limited	63850-0010
Anastrozole	Anastrozole 1 mg/1	TabletOral	NuCare Pharmaceuticals,Inc.	68071-3838
Anastrozole	Anastrozole 1 mg/1	TabletOral	NuCare Pharmaceuticals, Inc.	68071-3853
Anastrozole	Anastrozole 1 mg/1	TabletOral	NuCare Pharmaceuticals,Inc.	68071-4038
Anastrozole	Anastrozole 1 mg/1	TabletOral	Bryant Ranch Prepack	71335-1879