Theodore Robertson Pak, MD, PHD
Infectious Disease Physician · Orange, CA
Theodore Robertson Pak, MD, PHD is an infectious disease physician with a practice address in Orange, California, and NPI 1013476100, issued on Mar 18, 2019. Check the license (California A203241, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Theodore Robertson Pak
- Credential
- MD, PHD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License numbers
- A203241 CA
291119 MA
Self-reported in NPPES; status is on the state search - Practice location
- 101 The City Dr S, Orange, CA 92868
- Phone
- (714) 456-8888
- Enumerated
- Mar 18, 2019
- Record last updated
- Jan 9, 2026
- Medicare enrollment
- Enrolled (PECOS I20250908002894); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2019
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 101 The City Dr S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Danny Abad, PAPhysician Assistant1477158673
- Edward AbaradoStudent in an Organized Health Care Education/Training Program1912855198
- Nagina Abdiani, DOGeriatric Medicine (Family Medicine) Physician1518543271
- Mariam Abdul-Latif, M.D.Pediatrics Physician1538418884
- Eric AbelloOtolaryngology Physician1922566215
- Brandon Abeyta, MDAnesthesiology Physician1841291804
Verify Theodore Robertson Pak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A203241Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average infectious disease physician in 2024
106 Medicare Part D claims for 18 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Dovato19 claims
- Atorvastatin Calcium15 claims
- Amlodipine Besylate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- UC RegentsOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Theodore Robertson Pak among 1,119 infectious disease physician records in California
Theodore Robertson Pak, MD, PHD is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 92% of them.
- NPI issued2019 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2019 · median 2003 among the 735 with a school on file
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Orange → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Rosa Andrade, MDOrange, CA 928681093919680
- Robert Armen, M.D.Orange, CA 928681225041080
- Thomas C Cesario, MDOrange, CA 928681265512354
- Coleen Cunningham, M.D.Orange, CA 928681205999075
- Catherine Diamond, MDOrange, CA 928681649350786
- Donald N Forthal, MDOrange, CA 928681215017363
- Shruti Gohil, M.D., M.P.H.Orange, CA 928681851375398
- Geeta K Gupta, MDOrange, CA 928681558441600
Common questions
What is Theodore Robertson Pak, MD, PHD's NPI number?
Theodore Robertson Pak, MD, PHD's National Provider Identifier (NPI) is 1013476100, issued on Mar 18, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Theodore Robertson Pak, MD, PHD located?
The NPPES record lists a practice address at 101 The City Dr S, Orange, CA, 92868. Phone: (714) 456-8888. Providers update this record themselves, so call before visiting.
How can I verify Theodore Robertson Pak, MD, PHD's license?
NPPES lists California license number A203241, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Theodore Robertson Pak, MD, PHD prescribe under Medicare Part D?
In 2024, Theodore Robertson Pak, MD, PHD had 106 Medicare Part D claims for 18 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.