George Ishak, M.D
NPI 1790190825 · Internal Medicine Physician · Thousand Oaks, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
George Ishak, M.D is a Internal Medicine Physician provider in Thousand Oaks, CA (NPI 1790190825).
Provider details
- NPI number
- 1790190825
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- A145111 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
693 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 415 | $82 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 106 | $125 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 66 | $85 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 54 | $180 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 37 | $122 |
| Advance Care Planning, First 30 Minutes99497 | 15 | $78 |
Practice location
Mailing address
Additional practice locations (3)
- 211 Eastmoor AveDaly City, CA 94015Phone: (415) 391-9686
- 18321 Clark StTarzana, CA 91356-3501Phone: (818) 810-0800
- 2190 Lynn Rd Ste 300Thousand Oaks, CA 91360-8024Phone: (805) 370-4802
Registry dates
- Enumerated
- 2014-06-27
- Last updated
- 2024-09-13
- Certified
- 2024-09-13
Frequently asked questions
- What is George Ishak's NPI number?
- George Ishak's National Provider Identifier (NPI) is 1790190825, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is George Ishak's specialty?
- George Ishak is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is George Ishak located?
- George Ishak's practice location on file with NPPES is 215 W Janss Rd, Thousand Oaks, CA 91360-1847.
- What is George Ishak's phone number?
- The practice phone number listed in the NPPES registry for George Ishak is (805) 497-2727.
- Does George Ishak accept Medicare?
- George Ishak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is George Ishak's NPI active?
- Yes — George Ishak's NPI (1790190825) is active in the NPPES registry as of the last update on 2024-09-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.