Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ronnie C Marrache, MD

Hospitalist Physician in Waterville, ME · enumerated 2006 · practices at Elm City Medical Associates.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821172396

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Registry record

Entity type Individual (Type 1)

Name Ronnie C Marrache

Credential MD

Sex Male

Practice address 109 Silver St, Waterville, ME, 04901

Phone (207) 872-0866

Fax (207) 872-8098

Enumeration date Oct 24, 2006

Last updated in NPPES May 24, 2017

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 014513 (ME) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 040730 (GA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
132900099	Medicaid	ME	-
025781	Other	ME	ANTHEM

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Ronnie Marrache?

The National Provider Identifier (NPI) for Ronnie Marrache is 1821172396, a Type 1 (individual) record in the CMS NPPES registry.

Where does Ronnie Marrache practice?

The practice location on file with NPPES is in Waterville, ME. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Lisa Marrache Family Medicine Physician · Waterville, ME NPI 1124130638 Elm City Medical Associates Internal Medicine Physician · Waterville, ME NPI 1942309752

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-05-24.