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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Barry Abelson, M.D.

Ophthalmology Physician in Andover, MA · enumerated 2005.

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

National Provider Identifier

1811990682

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark Barry Abelson
Credential M.D.
Sex Male
Practice address 138 Haverhill St, Ste 104, Andover, MA, 01810
Phone (978) 475-0705
Fax (978) 475-0008
Enumeration date May 24, 2005
Last updated in NPPES Nov 14, 2007

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 37429 (MA) Primary
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
2035618 Medicaid MA -
M08808 Other MA BLUECROSS/BLUESHIELD
26176 Other MA FALLON
15823 Other MA HARVARD PILGRIM HEALTHCAR
037429 Other MA TUFTS

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

How do I verify Mark Abelson's NPI record?
Cross-check NPI 1811990682 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1811990682 active?
Yes, as of the latest NPPES snapshot, NPI 1811990682 is active (record last updated 2007-11-14).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-14.