Dr. Jonathan E Efron, M.D.

Dr. Jonathan E Efron is a Surgery Physician provider (Surgery) practicing in Baltimore, MD, registered in the NPPES registry with NPI 1538144647 since 2005. The credential MD stands for Doctor of Medicine.

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NPI	1538144647
Entity type	Individual (Type 1)
Name	Dr. Jonathan E Efron
Credential	M.D.
Sex	Male
Practice address	4940 EASTERN AVE, Baltimore, MD, 21224
Phone	4105500100
Enumeration date	2005-12-12
Last updated in NPPES	2014-02-10

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
208C00000X	Colon & Rectal Surgery Physician	Secondary	33553	AZ
208600000X	Surgery Physician	Primary	D69531	MD

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
418309600	Medicaid	MD	—
P00217762	Other	AZ	RAILROAD MEDICARE
912742	Medicaid	AZ	—
86080015085259A982	Other	AZ	TRIWEST

Copy-ready billing details

Provider: Jonathan Efron, M.D.
NPI: 1538144647
Taxonomy: 208600000X (Surgery Physician)
Address: 4940 EASTERN AVE, Baltimore, MD, 21224

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1023935624	Yolanda Morales	Individual	Pediatric Registered Nurse	Baltimore, MD
1841295714	Jerome Shier	Individual	Allergy & Immunology (Internal Medicine) Physician	Baltimore, MD
1407854557	Kathy Bull-Henry	Individual	Gastroenterology Physician	Baltimore, MD
1922008549	Johns Hopkins University	Organization	Pain Medicine (Anesthesiology) Physician	Baltimore, MD
1275515546	Johns Hopkins University	Organization	Plastic Surgery Physician	Baltimore, MD
1629054812	Janine Coy	Individual	Physician Assistant	Baltimore, MD
1164495164	Esma Akin	Individual	Body Imaging Physician	Baltimore, MD
1447224654	Mark Lottes	Individual	Diagnostic Radiology Physician	Baltimore, MD

Verify this record

Cross-check NPI 1538144647 against the authoritative CMS record: view Dr. Jonathan E Efron on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

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.

What specialty is Jonathan Efron?

Jonathan Efron 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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-02-10.