Johnny Sia Gaw, M.D.
Cardiovascular Disease Physician · Monrovia, CA
Johnny Sia Gaw, M.D. is a cardiovascular disease physician with a practice address in Monrovia, California, and NPI 1194717512, issued on Aug 22, 2005. Check the license (California A38464, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Johnny Sia Gaw
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A38464 CA
Self-reported in NPPES; status is on the state search - Practice location
- 831 E Huntington Dr Ste 101, Monrovia, CA 91016
- Phone
- (702) 579-3203
- Enumerated
- Aug 22, 2005
- Record last updated
- Dec 15, 2025
- Medicaid ID
- 00A384640 CA
- Medicare enrollment
- Enrolled (PECOS I20111214000118); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 831 E Huntington Dr Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Daisha Ortega, MDFamily Medicine Physician1356905954
- Nandar Swe, MDInternal Medicine Physician1730392655
- Jocelyn Wang, NPAdult Health Nurse Practitioner1669852166
- Zaw Ye, MDFamily Medicine Physician1144886599
Verify Johnny Sia Gaw in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A38464Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
1,941 Medicare Part D claims for 179 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. 46 claims were for opioids.
Most prescribed
- Atorvastatin Calcium199 claims
- Amlodipine Besylate135 claims
- Losartan Potassium108 claims
- Metformin Hcl81 claims
- Alendronate Sodium70 claims
- Metoprolol Succinate64 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
- Healthcare Partners Affiliates Medical GroupCarson, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Johnny Sia Gaw among 2,574 cardiovascular disease physician records in California
Johnny Sia Gaw, M.D. is one of 2,574 cardiovascular disease physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1973 · median 1999 among the 1,742 with a school on file
- Record last updated2025 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Monrovia → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Arsen Hovanesyan, MDMontrose, CA 910201801011085
- Liying Cai, M.D., PH.D.Duarte, CA 910101023278884
- Sherwin Dela Cruz, M.D.Duarte, CA 910101134407448
- Faizi Jamal, MDDuarte, CA 910101538217567
- Matthew Pulaski, M.D.Duarte, CA 910101114487733
- Swetha Ramachandran, MDDuarte, CA 910101811428733
- Syed Samee, MDDuarte, CA 910101548311814
- Michael Tran, MDDuarte, CA 910101770509473
Common questions
What is Johnny Sia Gaw, M.D.'s NPI number?
Johnny Sia Gaw, M.D.'s National Provider Identifier (NPI) is 1194717512, issued on Aug 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Johnny Sia Gaw, M.D. located?
The NPPES record lists a practice address at 831 E Huntington Dr Ste 101, Monrovia, CA, 91016. Phone: (702) 579-3203. Providers update this record themselves, so call before visiting.
How can I verify Johnny Sia Gaw, M.D.'s license?
NPPES lists California license number A38464, 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 Johnny Sia Gaw, M.D. prescribe under Medicare Part D?
In 2024, Johnny Sia Gaw, M.D. had 1,941 Medicare Part D claims for 179 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. 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.