Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Heidi Beth Isenberg-Feig, M.D.
Allergy Physician in Rockville, MD · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1790783470
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Registry record
Entity type Individual (Type 1)
Name Dr. Heidi Beth Isenberg-Feig
Credential M.D.
Sex Female
Practice address 6000 Executive Blvd, Suite 625, Rockville, MD, 20852
Phone (240) 314-7080
Fax (240) 314-7082
Enumeration date Jul 7, 2005
Last updated in NPPES Oct 11, 2012
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 Heidi Isenberg-Feig?
Heidi Isenberg-Feig is registered in NPPES with the primary taxonomy of Allergy 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 → Aglae Economides Pediatrics Physician · Rockville, MD NPI 1023002235 Shelby Josephs Allergy & Immunology Physician · North Bethesda, MD NPI 1396723805 Executive Rehabilitation & Sports Therapy, Inc. Physical Therapist · Rockville, MD NPI 1992764492 Elliot R Goldstein MD & Joel R Schulman MD PA Internal Medicine Physician · Rockville, MD NPI 1164488300 Saba Medhane Internal Medicine Physician · Rockville, MD NPI 1205893542 Mark Immergut Urology Physician · Rockville, MD NPI 1770540056 Laura Brown Internal Medicine Physician · Rockville, MD NPI 1255399234 Joel Schulman Internal Medicine Physician · Rockville, MD NPI 1053379032
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-10-11.