Independent US Healthcare Provider Directory & Public Medical Database Patient Guides
Medical Specialty Listing

Specialists in Thousand Oaks, CA

Browse 25 Specialist providers listed in NPPES with a practice address in Thousand Oaks, California.

25 Healthcare Providers

How Thousand Oaks compares with the U.S.

Thousand Oaks has 20 Specialists per 100,000 residents, 10% higher than the U.S. rate of 18.

That is 25 active Specialists with a practice address in Thousand Oaks, for a population of 125,205.

The California rate is 15 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places.

90% of Specialists in Thousand Oaks listed in the CMS Medicare file (9 of 10) accept Medicare assignment. That is similar to the California share of 92%.

Only 10 of 25 active Specialists in Thousand Oaks appear in the CMS Medicare file, so this share describes that smaller group.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

10% of Specialists in Thousand Oaks listed in the CMS Medicare file (1 of 10) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the California share of 29%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Specialist Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Specialist practitioners in Thousand Oaks, CA

Source: CMS PECOS
PECOS Enrolled Specialists 11 In Thousand Oaks, CA
Part B Lab & Imaging Eligible Suppressed Diagnostic Referrals
DME Ordering Eligible Suppressed Durable Medical Equipment
Home Health Agency Referrals Suppressed HHA Ordering Eligible
Showing 1โ€“20 of 25 providers
With recent CMS data first, then Aโ€“Z

Manijeh Ezatvar , RPT

Specialist

Active NPI Status
1000 Newbury Rd, Suite 120, Thousand Oaks, CA 913206435
Phone: 8053750001
NPI Identifier 1598909855
View Full Profile
Active NPI Status Accepts Medicare Assignment
555 Marin St, Ste 100, Thousand Oaks, CA 913604102
Phone: 8054944797
NPI Identifier 1740372028
View Full Profile

Dr. Rosemary Flores , MD

Specialist

Active NPI Status Accepts Medicare Assignment
3180 Willow Ln, #200, Thousand Oaks, CA 913614941
Phone: 8054973239
NPI Identifier 1871593095
View Full Profile
Active NPI Status Accepts Medicare Assignment
3379 Montagne Way, Thousand Oaks, CA 913624836
Phone: 8054924674
NPI Identifier 1669566790
View Full Profile

Dr. Alister A George , MD

Specialist

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
3510 N. Moorpark Rd, Suite 201, Thousand Oaks, CA 91360
Phone: 8054924800
NPI Identifier 1821280629
View Full Profile

Dr. Robert Ghaussy , MD

Specialist

Active NPI Status
3180 Willow Ln, #200, Thousand Oaks, CA 913614941
Phone: 8054973239
NPI Identifier 1053311274
View Full Profile

Melissa M Johns , PT

Specialist

Active NPI Status
101 Hodencamp Road, Ste 100, Thousand Oaks, CA 91360
Phone: 8054950516
NPI Identifier 1881606317
View Full Profile

Dr. John T Millington , MD

Specialist

Active NPI Status Accepts Medicare Assignment
2220 Lynn Rd, Suite 102, Thousand Oaks, CA 913601904
Phone: 8054941222
NPI Identifier 1740346931
View Full Profile

Dr. Gregory H. Tchejeyan , MD, INC

Specialist

Active NPI Status Accepts Medicare Assignment
250 Lombard St Ste 1, Thousand Oaks, CA 913608208
Phone: 8054953687
NPI Identifier 1689668188
View Full Profile

Dr. Edwin T Tseng , MD

Specialist

Active NPI Status
2220 Lynn Rd, Suite 109, Thousand Oaks, CA 913601904
Phone: 8054698103
NPI Identifier 1609897271
View Full Profile

Tessa Waggoner , PT

Specialist

Active NPI Status
77 Rolling Oaks Dr Ste 100, Thousand Oaks, CA 913611017
Phone: 8052853562
NPI Identifier 1003033846
View Full Profile

Dr. Glenn Eric Waldman , MD

Specialist

Active NPI Status Accepts Medicare Assignment
415 Rolling Oaks Dr, Suite 190, Thousand Oaks, CA 913611029
Phone: 8054944797
NPI Identifier 1881665586
View Full Profile

Dr. Sima Yaftali , MD

Specialist

Active NPI Status Accepts Medicare Assignment
3180 Willow Ln, #200, Thousand Oaks, CA 913614941
Phone: 8054973239
NPI Identifier 1629078845
View Full Profile

Dr. Andre S Yousefia , MD

Specialist

Active NPI Status Accepts Medicare Assignment
227 W Janss Rd, Suite 100, Thousand Oaks, CA 913601848
Phone: 8052302333
NPI Identifier 1992735930
View Full Profile

Ronald Brooks , RPT

Specialist

Active NPI Status
1333 E Thousand Oaks Blvd, Suite #108, Thousand Oaks, CA 913622826
Phone: 8054972294
NPI Identifier 1891919114
View Full Profile

Dr. Miriam H De Lyon , MD

Specialist

Active NPI Status
299 W Hillcrest Dr Ste 100, Thousand Oaks, CA 913607820
Phone: 8054977888
NPI Identifier 1952430431
View Full Profile
Active NPI Status
1735 Sweet Briar Pl, Thousand Oaks, CA 913621256
Phone: 8057961101
NPI Identifier 1952721631
View Full Profile

Dr. Michael H Gollub , MD

Specialist

Active NPI Status
299 W Hillcrest Dr Ste 100, Thousand Oaks, CA 913607820
Phone: 8054977888
NPI Identifier 1881723351
View Full Profile

Vrej Grigorian

Specialist

Active NPI Status
1202 Calle Pecos, Thousand Oaks, CA 913602347
Phone: 8054982766
NPI Identifier 1972708840
View Full Profile

Dr. Leandro Grimaldi , MD, MPH, EMBA

Specialist

Active NPI Status
1 Amgen Center Dr, Thousand Oaks, CA 913201799
Phone: 8054471000
NPI Identifier 1063364347
View Full Profile

Frequently Asked Questions about Specialist in Thousand Oaks

How do I check a Specialist practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.