Asia Day Downing
Internal Medicine Physician · Santa Rosa, CA
Asia Day Downing is an internal medicine physician with a practice address in Santa Rosa, California, and NPI 1316365265, issued on Mar 28, 2014. Check the license (California A154671, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Asia Day Downing
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A154671 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1165 Montgomery Dr, Santa Rosa, CA 95405
- Phone
- (707) 547-5437
- Enumerated
- Mar 28, 2014
- Record last updated
- Sep 14, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (707) 547-5430
- Medicare enrollment
- Enrolled (PECOS I20180426002814); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1165 Montgomery Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maryam Aghighi, MDAnatomic Pathology & Clinical Pathology Physician1073074977
- Johnathan Agil, MDEmergency Medicine Physician1700413002
- Katherine Aldrich, NPAdult Health Nurse Practitioner1194995563
- Mujeeb Altaf, MBBS.,MRCP(UK)Hospitalist Physician1316125941
- Rebecca Althoff, RNFARegistered Nurse First Assistant1427119668
- Sanyogeeta Bhaway, M.D.Internal Medicine Physician1275828162
Verify Asia Day Downing in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A154671Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
347 Medicare Part D claims for 115 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 27 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass30 claims
- Pantoprazole Sodium20 claims
- Brilinta16 claims
- Furosemide13 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.
Industry payments in 2024: $228.20
2 payments; by number, the most common kind was food and beverage; the largest payer was Edwards Lifesciences Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Medical FoundationSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Asia Day Downing among 17,696 internal medicine physician records in California
Asia Day Downing 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 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2013 · median 2004 among the 11,065 with a school on file
- Record last updated2018 · 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).
98 internal medicine physician records list a practice address in Santa Rosa
They are 98 of the 6,884 NPPES records with a practice address in Santa Rosa, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Rosa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nicholas Anton, MDSanta Rosa, CA 954051659364933
- George Bisbee, MDSanta Rosa, CA 954051235122516
- David Capaccio, DOSanta Rosa, CA 954051457355364
- David Charp, M.D.Santa Rosa, CA 954051053335208
- Catherine Davis, MDSanta Rosa, CA 954051497748776
- Marlon Decastro, M.D.Santa Rosa, CA 954051780643270
- John Hurwitz, DOSanta Rosa, CA 954051124018262
- Adina Logan, M.D.Santa Rosa, CA 954051881667178
Common questions
What is Asia Day Downing's NPI number?
Asia Day Downing's National Provider Identifier (NPI) is 1316365265, issued on Mar 28, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Asia Day Downing located?
The NPPES record lists a practice address at 1165 Montgomery Dr, Santa Rosa, CA, 95405. Phone: (707) 547-5437. Providers update this record themselves, so call before visiting.
How can I verify Asia Day Downing's license?
NPPES lists California license number A154671, 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 Asia Day Downing prescribe under Medicare Part D?
In 2024, Asia Day Downing had 347 Medicare Part D claims for 115 beneficiaries; 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.