DR. MARIAN ISAAK MD
NPI 1083340004
Internal Medicine in Holyoke, MA

Q: What is Marian Isaak's NPI number?

The NPI number for Marian Isaak is 1083340004. It was assigned to this individual provider in the NPPES registry on August 1, 2022.

Q: What is Marian Isaak's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Marian Isaak was last updated on September 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 01, 2022PECOS EnrolledAccepts Medicare Assignment

575 BEECH ST, HOLYOKE, MA 01040(413) 534-2500 Get Directions Write a Review

NPPES record last updated: September 26, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. Marian Isaak Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARIAN ISAAK MD (NPI 1083340004) is an individual internal medicine provider in Holyoke, Massachusetts, licensed in Massachusetts (1024101) and active in the NPI registry since August 2022. She is enrolled in Medicare PECOS, is affiliated with Holyoke Medical Center, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1083340004

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. MARIAN ISAAKCredential: MD

Location Address575 BEECH STHolyoke, MA 01040-2223

Mailing Address575 Beech StHolyoke, MA 01040-2223 · (203) 743-0100

Phone(413) 534-2500

Sole ProprietorNo

Medical School CMSOtherGraduated 2021

Enumeration DateAugust 1, 2022

Last NPPES UpdateSeptember 26, 2025

NPPES CertifiedSeptember 26, 2025

✔ NPI 1083340004 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MA · 1024101

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

575 BEECH ST, Holyoke, MA 01040

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Marian Isaak Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6305311838

PECOS Enrollment IDI20260413000123

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Holyoke Medical Center

Acute Care Hospitals · Holyoke, MA

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220024

Location575 Beech StreetHolyoke, MA 01040 · Hampden County

Emergency services

Baystate Medical Center

Acute Care Hospitals · Springfield, MA

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220077

Location759 Chestnut StreetSpringfield, MA 01199 · Hampden County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01040 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$134.47 typical visit price

range $58.86 – $177.36

Typical copayment $33.61 (range $14.71 – $44.34)

Most-billed visit code 99204

Established Patient

$103.48 typical visit price

range $19.11 – $144.84

Typical copayment $25.87 (range $4.77 – $36.21)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MARISSA CHIAPPERINO MPH,RD,CSO,CDE,CNSC

Dietitian, Registered

575 BEECH ST
HOLYOKE, MA 01040

Hampden County (845) 279-1135

MRINAL S MALI M.D.

Radiology (Diagnostic Radiology)

575 BEECH ST, HOLYOKE MEDICAL CENTER
HOLYOKE, MA 01040

Hampden County (413) 534-2523

PIYUSH R JOHARI M.D.

Psychiatry & Neurology (Psychiatry)

575 BEECH ST, 5TH FLOOR
HOLYOKE, MA 01040

Hampden County (413) 534-2697

ASHLEY M LANDRY PA-C

Physician Assistant

575 BEECH ST
HOLYOKE, MA 01040

Hampden County (413) 534-2500

ROENGSAK TULATHIMUTTE MD

Anesthesiology

575 BEECH ST, ANESTHESIA DEPT
HOLYOKE, MA 01040

Hampden County (413) 534-2845

VAMSEEDHAR ALLA M.D.

Internal Medicine

575 BEECH ST
HOLYOKE, MA 01040

Hampden County (413) 534-2500

HOLYOKE MEDICAL CENTER, INC.

Psychiatric Unit

575 BEECH ST
HOLYOKE, MA 01040

Hampden County (413) 534-2805

HOLYOKE MEDICAL CENTER, INC.

Hospitalist

575 BEECH ST
HOLYOKE, MA 01040

Hampden County (413) 534-2805

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marian Isaak's NPI number?

The NPI number for Marian Isaak is 1083340004. It was assigned to this individual provider in the NPPES registry on August 1, 2022.

Where is Marian Isaak located?

Marian Isaak practices at 575 Beech St, Holyoke, MA 01040. The listed phone number is (413) 534-2500.

What is Marian Isaak's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Marian Isaak enrolled in Medicare?

Yes. Marian Isaak is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Marian Isaak accept?

Health plans from Anthem Blue Cross and Blue Shield list Marian Isaak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Marian Isaak affiliated with any hospitals?

According to CMS data, Marian Isaak is affiliated with Holyoke Medical Center and Baystate Medical Center.

When was this NPI record last updated?

The NPPES record for Marian Isaak was last updated on September 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.