Maria Isabel Bacay, MD
Internal Medicine Physician · Manteca, CA
Maria Isabel Bacay, MD is an internal medicine physician with a practice address in Manteca, California, and NPI 1679599070, issued on Jul 15, 2006. Check the license (California A51759, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maria Isabel Bacay
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A51759 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1140 Norman Dr, Manteca, CA 95336
- Phone
- (209) 825-6331
- Enumerated
- Jul 15, 2006
- Record last updated
- Jan 2, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (209) 825-6351
- Medicaid ID
- GR0099130 CA
- Medicare enrollment
- Enrolled (PECOS I20081008000248); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1140 Norman Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bernard Bacay, MDInternal Medicine Physician1629094032
- Craig Bobson, M.DAdult Medicine Physician1790772986
- Rhonda Brazil, N.P.Family Nurse Practitioner1497775902
- Cassandra McCurdy, MSN,NP-CNurse Practitioner1437179660
- Susan Nylen, NFPAddiction Medicine (Family Medicine) Physician1205823077
- Anil Sain, MDInternal Medicine Physician1992791180
Verify Maria Isabel Bacay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A51759Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.7 times the Medicare Part D claims of the average internal medicine physician in 2024
11,856 Medicare Part D claims for 792 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 231 claims were for opioids.
Most prescribed
- Levothyroxine Sodium555 claims
- Atorvastatin Calcium494 claims
- Amlodipine Besylate435 claims
- Losartan Potassium313 claims
- Metformin Hcl310 claims
- Rosuvastatin Calcium284 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.
The MIPS final score for 2023 (Medicare payment program): 83 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,290.27
52 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Bacay-Aruiza Medical Associates IncManteca, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria Isabel Bacay among 17,696 internal medicine physician records in California
Maria Isabel Bacay, MD 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1985 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 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).
21 internal medicine physician records list a practice address in Manteca
They are 21 of the 1,017 NPPES records with a practice address in Manteca, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Manteca → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Bernard Bacay, MDManteca, CA 953361629094032
- Santokh Bhullar, MDManteca, CA 953361760594105
- Russell Carter, MDManteca, CA 953361528049988
- Terry Croasdale, M.D.Manteca, CA 953361295713147
- M Jacqueline Galang, MDManteca, CA 953361972586097
- Abdul Khan, M.D.Manteca, CA 953361053399980
- Rahul Patel, M.D.Manteca, CA 953361659354868
- Anil Sain, MDManteca, CA 953361992791180
Common questions
What is Maria Isabel Bacay, MD's NPI number?
Maria Isabel Bacay, MD's National Provider Identifier (NPI) is 1679599070, issued on Jul 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria Isabel Bacay, MD located?
The NPPES record lists a practice address at 1140 Norman Dr, Manteca, CA, 95336. Phone: (209) 825-6331. Providers update this record themselves, so call before visiting.
How can I verify Maria Isabel Bacay, MD's license?
NPPES lists California license number A51759, 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 Maria Isabel Bacay, MD prescribe under Medicare Part D?
In 2024, Maria Isabel Bacay, MD had 11,856 Medicare Part D claims for 792 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Maria Isabel Bacay, MD's MIPS final score?
The 2023 MIPS final score is 83 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.