Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark J Adler

Hematology & Oncology Physician in Vista, CA · enumerated 2006 · practices at Medical Group of North County, Inc..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1174552533

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Registry record

Entity type Individual (Type 1)

Name Mark J Adler

Sex Male

Practice address 910 Sycamore Ave, Suite 102, Vista, CA, 92081

Phone (760) 598-1700

Fax (760) 598-1196

Enumeration date Jun 30, 2006

Last updated in NPPES Apr 30, 2008

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License G58922 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
00G589220	Medicaid	CA	-
5734915	Other	CA	GHI
830000207	Other	CA	RAILROAD MEDICARE

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.

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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 Mark Adler?

Mark Adler is registered in NPPES with the primary taxonomy of Hematology & Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Rupa Subramanian Hematology & Oncology Physician · Vista, CA NPI 1376547174 Carolyn Butler Primary Care Nurse Practitioner · Vista, CA NPI 1801889506 Chris Lewis Physician Assistant · Vista, CA NPI 1407883127 Stuart Kipper Internal Medicine Physician · Vista, CA NPI 1114956570 Medical Group of North County, Inc. Internal Medicine Physician · Vista, CA NPI 1306871306 Derek Helton Hematology & Oncology Physician · Vista, CA NPI 1801992839 Josephine Sutera Oncology Registered Nurse · Vista, CA NPI 1669671293

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-30.