Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ronald Mastouri, MD

Cardiovascular Disease Physician in Indianapolis, IN · enumerated 2008 · practices at Indianapolis Neurosurgical Group.

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

National Provider Identifier

1134389968

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Registry record

Entity type Individual (Type 1)

Name Ronald Mastouri

Credential MD

Sex Male

Practice address 1801 N Senate Ave, Mpc II Ste. 4000, Indianapolis, IN, 46202

Phone (317) 962-0095

Fax (317) 962-0113

Enumeration date Jun 16, 2008

Last updated in NPPES Mar 14, 2025

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care · License 11012317A (IN) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 01067326A (IN) 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
000000109684	Other	IN	ANTHEM PTAN
200982540	Medicaid	IN	-
P00910464	Other	IN	RAILROAD MEDICARE
000000663387	Other	IN	ANTHEM PTAN
000001132526	Other	IN	ANTHEM PTAN

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.

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Frequently asked questions

What specialty is Ronald Mastouri?

Ronald Mastouri is registered in NPPES with the primary taxonomy of Cardiovascular Disease Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-14.