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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

OAK TREE ORTHOPEDICS INC
NPI 1356061949
Orthopaedic Surgery in Corona, CA

Active since September 01, 2022
4254 GREEN RIVER RD, CORONA, CA 92878(657) 235-9355 Get Directions Write a Review

NPPES record last updated: October 20, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 3, 2024, Jun 13, 2023, Sep 1, 2022 (3 updates tracked since 2022).

About Oak Tree Orthopedics Inc NPPES

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

OAK TREE ORTHOPEDICS INC (NPI 1356061949) is a healthcare organization registered as an orthopaedic surgery in Corona, California and active in the NPI registry since September 2022. The organization maintains a secondary practice location in Newport Beach and lists Nasser Heyrani, Owner, as its authorized official.

NPPES Registry Identity

NPI1356061949
Entity TypeOrganization
Primary Taxonomy207X00000X
Legal Business NameOAK TREE ORTHOPEDICS INC
Location Address4254 GREEN RIVER RDCorona, CA 92878-3869
Mailing Address2710 N Bentley StOrange, CA 92867-2258 · (657) 235-9355
Phone(657) 235-9355
Organization SubpartNo
Authorized OfficialNasser HeyraniOwner · (657) 235-9355
Enumeration DateSeptember 1, 2022
Last NPPES UpdateOctober 20, 20263 updates tracked since enumeration
NPPES CertifiedOctober 20, 2026
✔ NPI 1356061949 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207X00000X
Definition
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.
Also ListedOrthopaedic Surgery · Foot and Ankle SurgeryTaxonomy 207XX0004X
4254 GREEN RIVER RD, Corona, CA 92878
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Secondary Practice Location 1

Location 120072 SW Birch St Ste 100Newport Beach, CA 92660-0794 · Phone (657) 235-9355

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oak Tree Orthopedics Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Oak Tree Orthopedics Inc, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Nasser Heyrani, M.D.
Orthopedic Surgery
NPI 1730523945
800 MAGNOLIA AVE STE 115
Corona, CA 92879
(657) 235-9355
✔ PECOS5.7 mi
Graeme Matthewson, MD
Orthopedic Surgery
NPI 1518578772
6815 NOBLE AVE
Van Nuys, CA 91405
(818) 901-6600
✔ PECOS✔ Accepts Medicare52 mi

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 Oak Tree Orthopedics Inc's NPI number?

The NPI number for Oak Tree Orthopedics Inc is 1356061949. It was assigned to this organization in the NPPES registry on September 1, 2022.

Where is Oak Tree Orthopedics Inc located?

Oak Tree Orthopedics Inc is located at 4254 Green River Rd, Corona, CA 92878. The listed phone number is (657) 235-9355.

What is Oak Tree Orthopedics Inc's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Oak Tree Orthopedics Inc enrolled in Medicare?

Yes. Oak Tree Orthopedics Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Oak Tree Orthopedics Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Orthopedic Surgery, reassign their Medicare billing to Oak Tree Orthopedics Inc. 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. Of these, 1 practice 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 Oak Tree Orthopedics Inc was last updated on October 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days 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.