Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark S Siskind, MD

Q: What is the NPI number for Mark Siskind?

The National Provider Identifier (NPI) for Mark Siskind is 1508840612, a Type 1 (individual) record in the CMS NPPES registry.

Nephrology Physician in Fall River, MA · enumerated 2005.

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

National Provider Identifier

1508840612

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Registry record

Entity type Individual (Type 1)

Name Mark S Siskind

Credential MD

Sex Male

Practice address 277 Pleasant St, Ste 305, Fall River, MA, 02721

Phone (401) 438-5950

Fax (401) 435-2561

Enumeration date Dec 1, 2005

Last updated in NPPES Oct 4, 2019

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 53848 (MA) Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 8373 (RI) 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
8373	Other	RI	BLUE CROSS
10137MIR	Other	-	HARVARD PILGRIM
000000033673	Other	MA	BOSTON MEDICAL
39004908	Other	-	RAILROAD MEDICARE
1488	Other	-	NEIGHBORHOOD
782413	Other	-	AETNA
J30013	Other	MA	BLUE CROSS
6198023	Medicaid	MA	-
008373	Other	-	TUFTS
0702100003	Other	-	CIGNA
3100129	Other	-	UNITED
7003280	Medicaid	RI	-
004616	Other	RI	BLUE CHIP
3110893	Medicaid	MA	-

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 Mark Siskind?

The National Provider Identifier (NPI) for Mark Siskind is 1508840612, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Siskind practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-10-04.