1. Home
  2. Directory
  3. California
  4. Castro Valley
  5. Orthopaedic Surgery
  6. NPI Profile

GREGG THOMAS POTTORFF M.D.
NPI 1477520096
Orthopaedic Surgery - Sports Medicine in Castro Valley, CA

Active since March 02, 2006PECOS EnrolledAccepts Medicare Assignment
19842 LAKE CHABOT RD, CASTRO VALLEY, CA 94546(510) 886-8844(510) 247-8280 Get Directions Write a Review

NPPES record last updated: June 7, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Gregg Thomas Pottorff M.d. NPPES

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

GREGG THOMAS POTTORFF M.D. (NPI 1477520096) is an individual sports medicine provider in Castro Valley, California, licensed in California (G61064) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1986).

NPPES Registry Identity

NPI1477520096
Entity TypeIndividualMale
Primary Taxonomy207XX0005X
Provider Legal NameGREGG THOMAS POTTORFFCredential: M.D.
Location Address19842 LAKE CHABOT RDCastro Valley, CA 94546-4002
Mailing Address19842 Lake Chabot RdCastro Valley, CA 94546-4002 · (510) 886-8844 · Fax (510) 247-8280
Phone(510) 886-8844
Fax(510) 247-8280
Sole ProprietorNo
Medical School CMSOtherGraduated 1986
Enumeration DateMarch 2, 2006
Last NPPES UpdateJune 7, 2012
✔ NPI 1477520096 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic Surgery · Sports MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207XX0005X
License✔ Licensed in CA · G61064
Definition
An orthopaedic surgeon trained in sports medicine provides appropriate care for all structures of the musculoskeletal system directly affected by participation in sporting activity. This specialist is proficient in areas including conditioning, training and fitness, athletic performance and the impact of dietary supplements, pharmaceuticals, and nutrition on performance and health, coordination of care within the team setting utilizing other health care professionals, field evaluation and management, soft tissue biomechanics and injury healing and repair. Knowledge and understanding of the principles and techniques of rehabilitation, athletic equipment and orthotic devices enables the specialist to prevent and manage athletic injuries.
Also ListedOrthopaedic SurgeryTaxonomy 207X00000X · License G61064 (CA)
19842 LAKE CHABOT RD, Castro Valley, CA 94546
Open in Google Maps ↗

Other Identifiers 2

Medicare ID-Type Unspecified00G610640
Medicare UPINF15734

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

Gregg Thomas Pottorff 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 ID9638241375
PECOS Enrollment IDI20240924001832
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 Gregg Pottorff reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Hill Health Inc A Medical Corporation
13 mi
General Practice
3300 WEBSTER ST
Oakland, CA 94609
  • Reassigned Medicare billing, California enrollment
  • 17 clinicians in this Medicare group
NPI 1245607456 (925) 327-6964
Contra Costa County
19 mi
Adult Mental Health
1420 WILLOW PASS RD
Concord, CA 94520
  • Reassigned Medicare billing, California enrollment
  • 530 clinicians in this Medicare group
NPI 1023188489 (925) 646-5480

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

Other Providers at the Same Location NPPES 8

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

ROBERT SCOTT FORSTER M.D.
Orthopaedic Surgery
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 886-8844
VIRGINIA Y LIEU MD
Orthopaedic Surgery (Orthopaedic Trauma)
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 750-1967
BASS MEDICAL GROUP
Orthopaedic Surgery
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 886-8844
ASSOCIATED SURGEONS OF HAYWARD
Orthopaedic Surgery
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 886-8844
WEBSTER ORTHOPAEDIC MEDICAL GROUP, A PROFESSIONAL CORPORATION
Orthopaedic Surgery
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (925) 556-7320
DR. VICTORIA S PAO M.D.
Plastic Surgery
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 537-1577
STEVEN SARKIS ZOURABIAN D.O.
Orthopaedic Surgery (Orthopaedic Trauma)
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 750-1967
JOANN STRANG FNP
Nurse Practitioner (Family)
19842 LAKE CHABOT RD
CASTRO VALLEY, CA 94546
Alameda County (510) 530-5043

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 Gregg Pottorff's NPI number?

The NPI number for Gregg Pottorff is 1477520096. It was assigned to this individual provider in the NPPES registry on March 2, 2006.

Where is Gregg Pottorff located?

Gregg Pottorff practices at 19842 Lake Chabot Rd, Castro Valley, CA 94546. The listed phone number is (510) 886-8844.

What is Gregg Pottorff's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Sports Medicine, with taxonomy code 207XX0005X.

Is Gregg Pottorff enrolled in Medicare?

Yes. Gregg Pottorff 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 Gregg Pottorff's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregg Pottorff reassigns Medicare benefits to 2 organizations: Hill Health Inc A Medical Corporation (Oakland, CA) and Contra Costa County (Concord, 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 Gregg Pottorff'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 Gregg Pottorff was last updated on June 7, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.