Arnold Sur-Tsoong Loo, D.O.
Internal Medicine Physician · Rohnert Park, CA
Arnold Sur-Tsoong Loo, D.O. is an internal medicine physician with a practice address in Rohnert Park, California, and NPI 1063716918, issued on Jan 7, 2011. Check the license (California 20A4953, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arnold Sur-Tsoong Loo
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A4953 CA
Self-reported in NPPES; status is on the state search - Practice location
- 490 City Center Drive, Rohnert Park, CA 94928
- Phone
- (707) 585-7780
- Enumerated
- Jan 7, 2011
- Record last updated
- Jan 7, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (707) 585-7784
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 490 City Center Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elizabeth Woods, NPNurse Practitioner1518969179
Verify Arnold Sur-Tsoong Loo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4953Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
11 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Arnold Sur-Tsoong Loo among 17,696 internal medicine physician records in California
Arnold Sur-Tsoong Loo, D.O. is one of 17,696 internal medicine 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 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 internal medicine physician records list a practice address in Rohnert Park
They are 9 of the 483 NPPES records with a practice address in Rohnert Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Rohnert Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nana Barnes, MDRohnert Park, CA 949281063900520
- Michael Bunce, MDRohnert Park, CA 949281740369875
- Sara Ganeless Levine, MDRohnert Park, CA 949281326122490
- Steven Gelber, M.D.Rohnert Park, CA 949281144495326
- Paul Johnson, MDRohnert Park, CA 949281881778876
- Hyejo Jun, MDRohnert Park, CA 949281982946547
- Nicholas Regennitter, MDRohnert Park, CA 949281013591031
- Bridgit Travinsky, M.D.Rohnert Park, CA 949281295153930
Common questions
What is Arnold Sur-Tsoong Loo, D.O.'s NPI number?
Arnold Sur-Tsoong Loo, D.O.'s National Provider Identifier (NPI) is 1063716918, issued on Jan 7, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Arnold Sur-Tsoong Loo, D.O. located?
The NPPES record lists a practice address at 490 City Center Drive, Rohnert Park, CA, 94928. Phone: (707) 585-7780. Providers update this record themselves, so call before visiting.
How can I verify Arnold Sur-Tsoong Loo, D.O.'s license?
NPPES lists California license number 20A4953, 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 Arnold Sur-Tsoong Loo, D.O. prescribe under Medicare Part D?
In 2024, Arnold Sur-Tsoong Loo, D.O. had 11 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.