Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. James Martinson, MD
Surgery Physician in Baltimore, MD · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1619505500
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Registry record
Entity type Individual (Type 1)
Name Dr. James Martinson
Credential MD
Sex Male
Practice address 9000 Franklin Square Dr Dept of, Baltimore, MD, 21237
Phone (443) 777-2000
Fax (443) 777-8489
Enumeration date Mar 28, 2020
Last updated in NPPES Jul 13, 2026
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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.
Frequently asked questions
What specialty is James Martinson?
James Martinson is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Michelle Bahrain Infectious Disease Physician · Baltimore, MD NPI 1649235425 Sunita Sharma Internal Medicine Physician · Baltimore, MD NPI 1255657938 Lera Ison Family Nurse Practitioner · Baltimore, MD NPI 1952787400 Christopher Haas Internal Medicine Physician · Baltimore, MD NPI 1063875516 Natasha Nundy Internal Medicine Physician · Baltimore, MD NPI 1205286697 Michael Yacovelli Emergency Medicine Physician · Baltimore, MD NPI 1417489220 Christopher Favero Family Medicine Physician · Baltimore, MD NPI 1881252617 Peyton Kremer Student in an Organized Health Care Education/Training Program · Baltimore, MD NPI 1770111445
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-13.