Merrill Ralph Nisam, MD in Larkspur, CA - Medicare Critical Care (intensivists)

Merrill Ralph Nisam, MD is a medicare enrolled "Internal Medicine - Pulmonary Disease" physician in Larkspur, California. He went to University Of California, Davis School Of Medicine and graduated in 1980 and has 46 years of diverse experience with area of expertise as Critical Care (intensivists). He is a member of the group practice Regents Univ Of California Ucsf and his current practice location is 1100 Larkspur Landing Cir Ste 10, Larkspur, California. You can reach out to his office (for appointments etc.) via phone at (415) 924-1214.

Merrill Ralph Nisam is licensed to practice in California (license number A45217) and he also participates in the medicare program. He may accept medicare assignments (which means he may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance) and his NPI Number is 1205824067.

Contact Information

	Merrill Ralph Nisam, MD
	1100 Larkspur Landing Cir Ste 10, Larkspur, CA 94939-1836
	(415) 924-1214
	(415) 924-1375

Map and Direction

Physician's Profile

Full Name	Merrill Ralph Nisam
Gender	Male
Speciality	Critical Care (intensivists)
Experience	46 Years
Location	1100 Larkspur Landing Cir Ste 10, Larkspur, California
Accepts Medicare Assignments	May be. He may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance.

Medical Education and Training:

Merrill Ralph Nisam attended and graduated from University Of California, Davis School Of Medicine in 1980

NPI Data:

NPI Number: 1205824067
Provider Enumeration Date: 10/06/2005
Last Update Date: 12/16/2025

Medicare PECOS Information:

PECOS PAC ID: 7214836857
Enrollment ID: I20040102000689

Medical Identifiers

Medical identifiers for Merrill Ralph Nisam such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1205824067	NPI	-	NPPES
ZZZ79929Z	Medicaid	CA

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207RC0200X	Internal Medicine - Critical Care Medicine	A45217 (California)	Secondary
207RP1001X	Internal Medicine - Pulmonary Disease	A45217 (California)	Primary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Marinhealth Medical Center	Greenbrae, CA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Regents Univ Of California Ucsf	6305160300	249

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Merrill Ralph Nisam allows following entities to bill medicare on his behalf.

Entity Name	Aretaeus Telemedicine Inc
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1548490261 PECOS PAC ID: 6002953635 Enrollment ID: O20091029000684

Entity Name	Prima Medical Foundation
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1811217946 PECOS PAC ID: 6406040138 Enrollment ID: O20101027000334

Entity Name	Regents Univ Of California Ucsf
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1124439807 PECOS PAC ID: 6305160300 Enrollment ID: O20150122001375

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Merrill Ralph Nisam is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing Address	Practice Location Address
Merrill Ralph Nisam, MD 1100 Larkspur Landing Cir Ste 10, Larkspur, CA 94939-1836 Ph: (415) 924-1214	Merrill Ralph Nisam, MD 1100 Larkspur Landing Cir Ste 10, Larkspur, CA 94939-1836 Ph: (415) 924-1214

Reviews and Comments

Internal Medicine Doctors in Larkspur, CA

Dr. Sujoya Dey, MD Pulmonary Disease Medicare: May Accept Medicare Assignments Practice Location: 2 Bon Air Rd, Suite 100, Larkspur, CA 94939 Phone: 415-927-0666 Fax: 415-927-6168
Dr. Sahar Naderi, M.D. Pulmonary Disease Medicare: Accepting Medicare Assignments Practice Location: 2 Bon Air Rd Ste 100, Larkspur, CA 94939 Phone: 415-927-0666
Dr. Mark P. Wexman, M.D. Pulmonary Disease Medicare: Medicare Enrolled Practice Location: 2 Bon Air Rd, Larkspur, CA 94939 Phone: 415-927-0666 Fax: 415-927-6159
Dr. Arundathi Shenoy Malladi, M.D. Pulmonary Disease Medicare: May Accept Medicare Assignments Practice Location: 2 Bon Air Rd., #150, Larkspur, CA 94939 Phone: 415-464-9604 Fax: 415-464-0171
Dr. Margaret L. Baer, M.D. Pulmonary Disease Medicare: Not Enrolled in Medicare Practice Location: 2 Bon Air Rd, #100, Larkspur, CA 94939 Phone: 415-927-0666 Fax: 415-927-6168
Dr. Ines Sherifi, M.D. Pulmonary Disease Medicare: May Accept Medicare Assignments Practice Location: 2 Bon Air Rd, Larkspur, CA 94939 Phone: 415-927-0666 Fax: 415-927-6168

Merrill Ralph Nisam, MD - Medicare Critical Care (intensivists) in Larkspur, CA