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DR. HILLARY GAYLE HENDRYK M.D.
NPI 1528370616
Obstetrics & Gynecology in Modesto, CA

Active since July 06, 2010PECOS EnrolledAccepts Medicare Assignment
1401 SPANOS CT STE 230, MODESTO, CA 95355(209) 550-4720(209) 572-2583 Get Directions Write a Review

NPPES record last updated: December 18, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 18, 2025, Jan 11, 2022 (2 updates tracked since 2022).

About Dr. Hillary Gayle Hendryk M.d. NPPES

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

DR. HILLARY GAYLE HENDRYK M.D. (NPI 1528370616) is an individual obstetrics & gynecology provider in Modesto, California, licensed in California (130809) and active in the NPI registry since July 2010. She is enrolled in Medicare PECOS and is a graduate of Oregon Health Sciences University School Of Medicine (2010).

NPPES Registry Identity

NPI1528370616
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameDR. HILLARY GAYLE HENDRYKCredential: M.D.
Location Address1401 SPANOS CT STE 230Modesto, CA 95355-2816
Mailing AddressPo Box 255228Sacramento, CA 95865-5228 · (800) 470-0071 · Fax (916) 854-6769
Phone(209) 550-4720
Fax(209) 572-2583
Sole ProprietorNo
Medical School CMSOregon Health Sciences University School Of MedicineGraduated 2010
Enumeration DateJuly 6, 2010
Last NPPES UpdateDecember 18, 20252 updates tracked since enumeration
NPPES CertifiedDecember 18, 2025
✔ NPI 1528370616 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
Licenses✔ Licensed in CA · 130809✔ Licensed in AZ · R72247
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
1401 SPANOS CT STE 230, Modesto, CA 95355
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Other Names 1

Other Name (5)Dr. Hillary Gayle Foster M.d.

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

Dr. Hillary Gayle Hendryk 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 ID6305169921
PECOS Enrollment IDI20150106000961
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 Reassignments

2

Medicare enrollment records show Hillary Hendryk reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Sutter Valley Medical Foundation
1.2 mi
Multi-Specialty
600 COFFEE RD
Modesto, CA 95355
  • Reassigned Medicare billing, California enrollment
  • 3,056 clinicians in this Medicare group
NPI 1669846986 (209) 524-1211
Permanente Medical Group Inc
30 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

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 95355 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
$133.94 typical visit price
range $58.87 – $176.60
Typical copayment $33.48 (range $14.71 – $44.15)
Most-billed visit code 99204
Established Patient
$73.16 typical visit price
range $19.28 – $144.60
Typical copayment $18.29 (range $4.82 – $36.15)
Most-billed visit code 99213
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 5

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

STEPHANE ERLENE ZAMAYOA
Social Worker
1401 SPANOS CT STE 230
MODESTO, CA 95355
Stanislaus County (209) 524-9401
ROCIO ACERA POZZI MD
Obstetrics & Gynecology
1401 SPANOS CT STE 230
MODESTO, CA 95355
Stanislaus County (209) 569-7408
JOSEPH SAMI MANSOUR MD
Obstetrics & Gynecology
1401 SPANOS CT STE 230
MODESTO, CA 95355
Stanislaus County (209) 550-4720
OLGA MIKHAILOVNA KOVALENKO MD
Obstetrics & Gynecology
1401 SPANOS CT STE 230
MODESTO, CA 95355
Stanislaus County (209) 550-4720
MARISSA SUE BUENDIA DO
Obstetrics & Gynecology
1401 SPANOS CT STE 230
MODESTO, CA 95355
Stanislaus County (209) 550-4720

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 Hillary Hendryk's NPI number?

The NPI number for Hillary Hendryk is 1528370616. It was assigned to this individual provider in the NPPES registry on July 6, 2010. The provider is also known as Dr. Hillary Gayle Foster M.D..

Where is Hillary Hendryk located?

Hillary Hendryk practices at 1401 Spanos Ct Ste 230, Modesto, CA 95355. The listed phone number is (209) 550-4720.

What is Hillary Hendryk's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Hillary Hendryk enrolled in Medicare?

Yes. Hillary Hendryk 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 organizations bill Medicare for Hillary Hendryk's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hillary Hendryk reassigns Medicare benefits to 2 organizations: Sutter Valley Medical Foundation (Modesto, CA) and Permanente Medical Group Inc (Stockton, CA). Each 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 Hillary Hendryk'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 Hillary Hendryk was last updated on December 18, 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.