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JAMES WATERHOUSE M.D.
NPI 1881772630
Internal Medicine in San Leandro, CA

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment
2500 MERCED ST, SAN LEANDRO, CA 94577(510) 454-1000 Get Directions Write a Review

NPPES record last updated: November 30, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About James Waterhouse M.d. NPPES

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

JAMES WATERHOUSE M.D. (NPI 1881772630) is an individual internal medicine provider in San Leandro, California, licensed in California (G57842) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Tennessee, Hsc, College Of Medicine (1984).

NPPES Registry Identity

NPI1881772630
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJAMES WATERHOUSECredential: M.D.
Location Address2500 MERCED STSan Leandro, CA 94577-4201
Mailing Address2500 Merced StSan Leandro, CA 94577-4201 · (510) 454-1000
Phone(510) 454-1000
Sole ProprietorNo
Medical School CMSUniversity Of Tennessee, Hsc, College Of MedicineGraduated 1984
Enumeration DateNovember 1, 2006
Last NPPES UpdateNovember 30, 2021
✔ NPI 1881772630 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G57842
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.
2500 MERCED ST, San Leandro, CA 94577
Open in Google Maps ↗

Other Identifiers 1

Medicaid00G578420CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

James Waterhouse M.d. 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 ID749479335
PECOS Enrollment IDI20110113000195
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.

Medicare Billing Reassignment

Medicare enrollment records show James Waterhouse reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
15 mi
Internal Medicine
1190 VETERANS BLVD
Redwood City, CA 94063
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1639252604 (650) 299-2000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94577 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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.

DR. SHIENA SHARMA MD
Anesthesiology
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 454-1000
ANTHONY MICHAEL BATTAGLIA RN
Registered Nurse
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 454-1000
DR. ELIZABETH MACERA N.P.
Nurse Practitioner
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 454-1000
MS. TSUI TAM PHARM. D.
Pharmacist
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 454-2747
JEFFREY LI M.D.
Radiology (Diagnostic Radiology)
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 737-3032
CHIN-HSIANG FENG
Emergency Medicine
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 518-5598
MS. JESSICA RAE MARTINEZ CNM
Advanced Practice Midwife
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (925) 548-4751
DR. GRACE MINDY LEE M.D.
Emergency Medicine
2500 MERCED ST
SAN LEANDRO, CA 94577
Alameda County (510) 454-1000

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 James Waterhouse's NPI number?

The NPI number for James Waterhouse is 1881772630. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is James Waterhouse located?

James Waterhouse practices at 2500 Merced St, San Leandro, CA 94577. The listed phone number is (510) 454-1000.

What is James Waterhouse's specialty?

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

Is James Waterhouse enrolled in Medicare?

Yes. James Waterhouse 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.

Which organization bills Medicare for James Waterhouse's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Waterhouse reassigns Medicare benefits to Permanente Medical Group Inc (Redwood City, CA). The 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 James Waterhouse's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for James Waterhouse was last updated on November 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.