Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mani Nallasivan, M.D.

Cardiovascular Disease Physician in Merced, CA · enumerated 2005.

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

National Provider Identifier

1639171606

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Registry record

Entity type Individual (Type 1)

Name Mani Nallasivan

Credential M.D.

Sex Male

Practice address Merced, CA, 95340

Phone (209) 723-6882

Fax (209) 723-6884

Enumeration date Aug 10, 2005

Last updated in NPPES Mar 14, 2019

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License A44096 (CA) Secondary

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License A44096 (CA) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License A44096 (CA) 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
A44096	Other	CA	LICENSE
1982977054	Medicaid	CA	-
GR0043810	Medicaid	CA	-

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 Mani Nallasivan?

The National Provider Identifier (NPI) for Mani Nallasivan is 1639171606, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mani Nallasivan practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-03-14.