DR. WILLIAM GRUNDLER M.D.
NPI 1750445201
Internal Medicine in Ventura, CA

Q: What is William Grundler's NPI number?

The NPI number for William Grundler is 1750445201. It was assigned to this individual provider in the NPPES registry on December 20, 2006.

Q: What is William Grundler'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 William Grundler was last updated on November 29, 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.

Active since December 20, 2006PECOS Enrolled

3291 LOMA VISTA RD, VENTURA, CA 93003(805) 652-6556 Get Directions Write a Review

NPPES record last updated: November 29, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. William Grundler M.d. NPPES

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

DR. WILLIAM GRUNDLER M.D. (NPI 1750445201) is an individual internal medicine provider in Ventura, California, licensed in California (G87153) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1750445201

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. WILLIAM GRUNDLERCredential: M.D.

Location Address3291 LOMA VISTA RDVentura, CA 93003-3099

Mailing Address3291 Loma Vista RdVentura, CA 93003-3099 · (805) 652-6556

Phone(805) 652-6556

Sole ProprietorNo

Enumeration DateDecember 20, 2006

Last NPPES UpdateNovember 29, 2021

✔ NPI 1750445201 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 · G87153

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.

3291 LOMA VISTA RD, Ventura, CA 93003

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. William Grundler M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 William Grundler reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group

7.0 mi

Health Maintenance Organization

2103 E GONZALES RD
Oxnard, CA 93036

Reassigned Medicare billing, California enrollment
13,921 clinicians in this Medicare group

NPI 1275756652 (805) 650-4700

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 93003 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

$140.72 typical visit price

range $62.32 – $185.36

Typical copayment $35.18 (range $15.58 – $46.34)

Most-billed visit code 99204

Established Patient

$108.74 typical visit price

range $20.68 – $151.85

Typical copayment $27.18 (range $5.17 – $37.96)

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.

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