What is NDC 55566-6500?

55566-6500 is the product NDC for Endometrin (progesterone), Progesterone 100 mg/1 insert, listed with the FDA by Ferring Pharmaceuticals Inc.. It has 2 package NDCs, shown above in 10- and 11-digit form.

Ferring Pharmaceuticals Inc., NDC labeler code 55566. The labeler is the company responsible for the label; it may be the manufacturer, a repackager or a distributor.

What other NDCs exist for Endometrin?

None: this is the only finished product listed under this name.

Is there a related HCPCS / J-code?

Not in Med-Code's curated HCPCS directory.

Endometrin NDC 55566-6500 | National Drug Code

NDC codes

FDA NDC Directory

Product NDC (as listed)55566-6500Labeler and product segments. Claims need a package NDC.

Product NDC at billing width55566-6500Add 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	Copy
55566-6500-3	5556665000355566650003	1 CARTON in 1 CARTON (55566-6500-3) / 21 BLISTER PACK in 1 CARTON (55566-6500-2) / 1 INSERT in 1 BLISTER PACK (55566-6500-1)Marketed from Jun 21, 2007
55566-6500-8	5556665000855566650008	1 CARTON in 1 CARTON (55566-6500-8) / 21 BLISTER PACK in 1 CARTON (55566-6500-7) / 1 INSERT in 1 BLISTER PACK (55566-6500-4)Marketed from Jun 21, 2007 · Sample package

How the 11-digit form is made: The package segment has 1 digit, so one leading zero is added to it (5-4-1 → 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): Endometrin
Generic name (nonproprietary): progesterone
Active ingredients: Progesterone — 100 mg/1
Dosage form: Insert
Route: Vaginal
Labeler: Ferring Pharmaceuticals Inc.NDC labeler code 55566
Product type: Prescription drug
Marketing category: NDA — New Drug ApplicationApplication NDA 022057
Marketing start: Jun 21, 2007
Listing expires: Dec 31, 2027
Other FDA classes: Progesterone (Chemical structure)
Identifiers: Product ID 55566-6500_7ff9c412-250d-4db8-b425-51c200241848SPL ID 7ff9c412-250d-4db8-b425-51c200241848SPL set ID 2ba50fa9-b349-40cb-9a4b-1af8faa4ec09RxCUI 725094, 725098UNII 4G7DS2Q64Y
Pharmacologic class: Progesterone

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 drug-specific HCPCS code in Med-Code's directory for this product. The directory is curated and not complete — check the current CMS HCPCS file before billing.

NDC on a medical claim

N455566650003 followed by a unit qualifier and the quantity

Package 55566-6500-03. 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 Jul 29, 2026.

Indications (excerpt from the label)

ENDOMETRIN ® is indicated, as part of an Assisted Reproductive Technology (ART) treatment program, to support embryo implantation in infertile women less than 35 years of age by supplementation of corpus luteal function and to maintain pregnancy after implantation up to 10 weeks. ENDOMETRIN is a progesterone indicated, as part of an Assisted Reproductive Technology (ART) treatment program, to support embryo implantation in infertile women less than 35 years of age by supplementation of corpus luteal function and to maintain pregnancy after implantation up to 10 weeks.

Excerpt only. Read the full label for complete information.

Full label on DailyMed (opens in a new tab)

About NDC 55566-6500

What is NDC 55566-6500?: 55566-6500 is the product NDC for Endometrin (progesterone), Progesterone 100 mg/1 insert, listed with the FDA by Ferring Pharmaceuticals Inc.. It has 2 package NDCs, shown above in 10- and 11-digit form.
What drug is associated with this NDC?: Endometrin (Progesterone).
What is the active ingredient?: Progesterone.
Who is the labeler?: Ferring Pharmaceuticals Inc., NDC labeler code 55566. The labeler is the company responsible for the label; it may be the manufacturer, a repackager or a distributor.
What other NDCs exist for Endometrin?: None: this is the only finished product listed under this name.
Is there a related HCPCS / J-code?: Not in Med-Code's curated HCPCS directory. See Billing references above.

Other NDCs under NDA 022057

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

FDA NDC Directory listings under NDA 022057
Product	Strength	Form · route	Labeler	Product NDC
Progesterone	Progesterone 100 mg/1	InsertVaginal	Sun Pharmaceutical Industries, Inc.	70095-136

Endometrin (Progesterone) NDC 55566-6500