NORTHBAY HEALTH MEDICAL FOUNDATION
NPI 1760283527
Internal Medicine in Fairfield, CA

Q: What is Northbay Health Medical Foundation's NPI number?

The NPI number for Northbay Health Medical Foundation is 1760283527. It was assigned to this organization in the NPPES registry on March 19, 2025. The provider is doing business as NorthBay Health Medical Network.

Q: What is Northbay Health Medical Foundation's specialty?

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

Active since March 19, 2025

4500 BUSINESS CENTER DR, FAIRFIELD, CA 94534(707) 646-3110 Get Directions Write a Review

NPPES record last updated: August 18, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Aug 18, 2026, Apr 7, 2026, Mar 19, 2025 (3 updates tracked since 2025).

On this page

About Northbay Health Medical Foundation NPPES

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

NORTHBAY HEALTH MEDICAL FOUNDATION (NPI 1760283527), doing business as Northbay Health Medical Network, is a healthcare organization registered as an internal medicine in Fairfield, California and active in the NPI registry since March 2025. The organization maintains a secondary practice location in Fairfield and lists Joseph D'angina, Board Member, as its authorized official.

NPPES Registry Identity

NPI1760283527

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameNORTHBAY HEALTH MEDICAL FOUNDATION

Location Address4500 BUSINESS CENTER DRFairfield, CA 94534-6888

Mailing Address4500 Business Center DrFairfield, CA 94534-6888 · (707) 646-3110

Phone(707) 646-3110

Organization SubpartNo

Authorized OfficialJoseph D'anginaBoard Member · (707) 646-3110

Enumeration DateMarch 19, 2025

Last NPPES UpdateAugust 18, 20263 updates tracked since enumeration

NPPES CertifiedAugust 18, 2026

✔ NPI 1760283527 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 13

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

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.

Also ListedEmergency MedicineTaxonomy 207P00000X

Also ListedFamily MedicineTaxonomy 207Q00000X

Also ListedInternal Medicine · Advanced Heart Failure and Transplant CardiologyTaxonomy 207RA0001X

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X

Also ListedInternal Medicine · Hematology & OncologyTaxonomy 207RH0003X

Also ListedInternal Medicine · Interventional CardiologyTaxonomy 207RI0011X

Also ListedInternal Medicine · Infectious DiseaseTaxonomy 207RI0200X

Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X

Also ListedOrthopaedic SurgeryTaxonomy 207X00000X

Also ListedPediatricsTaxonomy 208000000X

Also ListedPain Medicine · Pain MedicineTaxonomy 208VP0000X

Also ListedPodiatristTaxonomy 213E00000X

4500 BUSINESS CENTER DR, Fairfield, CA 94534

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Other Names 1

Doing Business AsNorthbay Health Medical Network

Secondary Practice Location 1

Location 15117 Business Center DrFairfield, CA 94534-1624 · Phone (707) 646-5500

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Northbay Health Medical Foundation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

224

Medicare enrollment records show 224 clinicians reassign Medicare billing to Northbay Health Medical Foundation, which bills Medicare for the services they deliver. Of these, 2 practice at this address and 83 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 42

Nurse Practitioner46

Family Practice24

Obstetrics/Gynecology16

Physical Therapist in Private Practice14

Internal Medicine12

Neurosurgery8

Vascular Surgery7

General Surgery6

34 other specialties91

Nearest to this location (20)

See all 224

May Tun, M.D.

Emergency Medicine

NPI 1851787717

4500 BUSINESS CENTER DR
Fairfield, CA 94534

(707) 646-5000

✔ PECOS✔ Accepts MedicareSame address

Annie Rose Condolon-Kohler, NP

Nurse Practitioner

NPI 1174086359

4520 BUSINESS CENTER DR
Fairfield, CA 94534

(707) 646-5500

✔ PECOS✔ Accepts MedicareSame address

Ehsan Ghods, D.O.

Family Practice

NPI 1386663508

4520 BUSINESS CENTER DRIVE SUITE 200
Fairfield, CA 94534

(707) 646-3500

✔ PECOS✔ Accepts Medicare0.1 mi

Laurie Bresee

Nurse Practitioner

NPI 1174004659

4520 BUSINESS CENTER DRIVE SUITE 180
Fairfield, CA 94534

(707) 646-3555

✔ PECOS✔ Accepts Medicare0.1 mi

Larissa Chartrand, M.D.

Internal Medicine

NPI 1851715627

4520 BUSINESS CENTER DRIVE 200
Fairfield, CA 94534

(707) 646-5500

✔ PECOS✔ Accepts Medicare0.1 mi

Ankit Dubey, MD

Internal Medicine

NPI 1275191249

4520 BUSINESS CENTER DR STE 200
Fairfield, CA 94534

(707) 646-5500

✔ PECOS✔ Accepts Medicare0.1 mi

Nicholas Maalouf, DO

Internal Medicine

NPI 1538861281

4520 BUSINESS CENTER DR 4520 BUSINESS CENTER DR
Fairfield, CA 94534

(707) 646-3500

✔ PECOS0.1 mi

Paarth Shah, MD

Internal Medicine

NPI 1548722580

4520 BUSINESS CENTER DR STE 200
Fairfield, CA 94534

(707) 646-5500

✔ PECOS✔ Accepts Medicare0.1 mi

Carmen Solano, MD

Family Practice

NPI 1831122332

4520 BUSINESS CENTER DRIVE #200
Fairfield, CA 94534

(707) 646-5500

✔ PECOS✔ Accepts Medicare0.1 mi

Scott Jackson, M.S., CCC-SLP

Qualified Speech Language Pathologist

NPI 1356494934

755 FALLEN LEAF CT
Fairfield, CA 94534

(707) 646-4150

✔ Accepts Medicare0.6 mi

Mounzer Alsamman, M.D.

Gastroenterology

NPI 1700822160

5140 BUSINESS CENTER DR SUTIE 180
Fairfield, CA 94534

(707) 646-3555

✔ PECOS✔ Accepts Medicare0.9 mi

Gilbert Chang, MD

Pediatric Medicine

NPI 1538195755

5140 BUSINESS CENTER DR SUITE 200
Fairfield, CA 94534

(707) 864-9999

✔ PECOS0.9 mi

Alina Hongsakaphadana, M.D.

Family Practice

NPI 1740304237

5140 BUSINESS CENTER DR SUITE 200
Fairfield, CA 94534

(707) 646-3500

✔ PECOS✔ Accepts Medicare0.9 mi

Marlene Freeman, M.D.

Obstetrics/Gynecology

NPI 1811960966

2702 LOW CT DEPT OF OB/GYN
Fairfield, CA 94534

(707) 432-2810

✔ PECOS✔ Accepts Medicare2.7 mi

Darlinda Shirmard, N.P.

Nurse Practitioner

NPI 1669688867

2702 LOW CT
Fairfield, CA 94534

(707) 432-2600

✔ PECOS2.7 mi

Frederick Blair, M.D.

Obstetrics/Gynecology

NPI 1386731768

1234 EMPIRE ST
Fairfield, CA 94533

(707) 427-4900

✔ PECOS✔ Accepts Medicare4.9 mi

Ameer Almullahassani, MD

Neurology

NPI 1245473131

1860 PENNSYLVANIA AVE SUITE 210
Fairfield, CA 94533

(707) 646-4380

✔ PECOS✔ Accepts Medicare5.2 mi

Jeffrey Breneisen, MD

Cardiovascular Disease (Cardiology)

NPI 1629058615

1860 PENNSYLVANIA AVE SUITE 120
Fairfield, CA 94533

(707) 646-4400

✔ PECOS✔ Accepts Medicare5.2 mi

Amanda Christian, APRN, CNM

Certified Nurse Midwife (CNM)

NPI 1972891273

1860 PENNSYLVANIA AVE STE 300
Fairfield, CA 94533

(707) 646-4100

✔ PECOS✔ Accepts Medicare5.2 mi

Donald Doyle, MD

Sleep Medicine

NPI 1699766220

1860 PENNSYLVANIA AVE SUITE 200
Fairfield, CA 94533

(707) 646-4180

✔ PECOS✔ Accepts Medicare5.2 mi

See all 224 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Northbay Health Medical Foundation's NPI number?

The NPI number for Northbay Health Medical Foundation is 1760283527. It was assigned to this organization in the NPPES registry on March 19, 2025. The provider is doing business as NorthBay Health Medical Network.

Where is Northbay Health Medical Foundation located?

Northbay Health Medical Foundation is located at 4500 Business Center Dr, Fairfield, CA 94534. The listed phone number is (707) 646-3110.

What is Northbay Health Medical Foundation's specialty?

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

Is Northbay Health Medical Foundation enrolled in Medicare?

Yes. Northbay Health Medical Foundation is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Northbay Health Medical Foundation?

According to the CMS Revalidation Reassignment List (October 2026 release), 224 clinicians in 42 Medicare specialties reassign their Medicare billing to Northbay Health Medical Foundation. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Nurse Practitioner (46), Family Practice (24) and Obstetrics/Gynecology (16). Of these, 2 practice at this address and 83 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Northbay Health Medical Foundation was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.