Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

James Stewart Lang, MD

Individual provider Internal Medicine Physician · NPI 1528488798

James Stewart Lang, MD is an Internal Medicine in Chelsea, Massachusetts. Qualified in 2014, 12 years ago. Practices with Optum Care Washington PLLC, a 685-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts and Washington.

Years since qualifying
12
Licensed in
MA, WA
In the registry since
2014
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

151 Everett Ave
Chelsea, MA 02150-1807
Phone: (617) 889-8520
Fax: (617) 889-8571
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 269504 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD61493634 (WA)

Record details

NPI number1528488798
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 25, 2014
Last updated in NPPESOctober 15, 2025
Certification dateOctober 15, 2025
Mailing address55 Fruit St, Boston, MA 02114-2621

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Group practice Optum Care Washington Pllc — 685 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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