James Stewart Lang, MD in Chelsea, MA - Medicare Internal Medicine

James Stewart Lang, MD is a medicare enrolled "Internal Medicine" physician in Chelsea, Massachusetts. He graduated from medical school in 2014 and has 11 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Optum Care Washington Pllc and his current practice location is 151 Everett Ave, Chelsea, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 889-8520.

James Stewart Lang is licensed to practice in Massachusetts (license number 269504) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1528488798.

Contact Information

	James Stewart Lang, MD
	151 Everett Ave, Chelsea, MA 02150-1807
	(617) 889-8520
	(617) 889-8571

Map and Direction

Physician's Profile

Full Name	James Stewart Lang
Gender	Male
Speciality	Internal Medicine
Experience	11 Years
Location	151 Everett Ave, Chelsea, Massachusetts
Accepts Medicare Assignments	Yes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.

Medical Education and Training:

James Stewart Lang graduated from medical school in 2014

NPI Data:

NPI Number: 1528488798
Provider Enumeration Date: 04/25/2014
Last Update Date: 10/15/2025

Medicare PECOS Information:

PECOS PAC ID: 5092018721
Enrollment ID: I20240306002367

Medical Identifiers

Medical identifiers for James Stewart Lang such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1528488798	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207R00000X	Internal Medicine	269504 (Massachusetts)	Primary
207R00000X	Internal Medicine	MD61493634 (Washington)	Secondary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Providence Regional Medical Center Everett	Everett, WA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Optum Care Washington Pllc	6406752153	597

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. James Stewart Lang allows following entities to bill medicare on his behalf.

Entity Name	The Polyclinic Pllc
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1174594634 PECOS PAC ID: 2163328196 Enrollment ID: O20031210000788

Entity Name	Optum Care Washington Pllc
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1831186766 PECOS PAC ID: 6406752153 Enrollment ID: O20031211000922

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. James Stewart Lang 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
James Stewart Lang, MD 55 Fruit St, Boston, MA 02114-2621 Ph: () -	James Stewart Lang, MD 151 Everett Ave, Chelsea, MA 02150-1807 Ph: (617) 889-8520

Reviews and Comments

Internal Medicine Doctors in Chelsea, MA

Elena Volozhanina, M.D. Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 1000 Broadway, Chelsea, MA 02150 Phone: 617-975-6200 Fax: 617-975-6151
Mercedes Freije Ibanez, MD Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 1000 Broadway, Chelsea, MA 02150 Phone: 617-975-6200
Faiz Khan, Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 151 Everett Ave, Chelsea, MA 02150 Phone: 617-884-8300
Jessica A Zeidman, M.D. Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 151 Everett Avenue, Chelsea Healthcare Center, Chelsea, MA 02150 Phone: 617-889-8580 Fax: 617-889-8579
Dr. Jose Antonio Abrego, MD Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 1000 Broadway, Chelsea, MA 02150 Phone: 617-975-6200 Fax: 617-975-6151
Arshia Siddiqui, M.D., MPH Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 151 Everett Ave, Chelsea, MA 02150 Phone: 617-884-8300
Dr. Victor Lewis, MD Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 151 Everett Ave, Chelsea Healthcare Center, Chelsea, MA 02150 Phone: 617-889-8580 Fax: 617-889-8579

James Stewart Lang, MD - Medicare Internal Medicine in Chelsea, MA