What is Marian Isaak's NPI number?

Marian Isaak's National Provider Identifier (NPI) is 1083340004, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Marian Isaak's specialty?

Marian Isaak is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Marian Isaak located?

Marian Isaak's practice location on file with NPPES is 575 Beech St, Holyoke, MA 01040-2223.

What is Marian Isaak's phone number?

The practice phone number listed in the NPPES registry for Marian Isaak is (413) 534-2500.

Is Marian Isaak's NPI active?

Yes — Marian Isaak's NPI (1083340004) is active in the NPPES registry as of the last update on 2025-09-26.

IndividualActive

Marian Isaak, MD

NPI 1083340004 · Internal Medicine Physician · Holyoke, MA

Marian Isaak, MD is a Internal Medicine Physician provider in Holyoke, MA (NPI 1083340004).

Provider details

NPI number: 1083340004
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Female
Sole proprietor: No
License: 1024101 (MA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense 1024101 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(60/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
3 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

575 Beech St

Holyoke, MA 01040-2223

Phone: (413) 534-2500

Street-level locationGet directions

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Mailing address