Oi Yi Tin-Mejia, MBA, MS, RD
Registered Dietitian · Monterey Park, CA
Oi Yi Tin-Mejia, MBA, MS, RD is a registered dietitian with a practice address in Monterey Park, California, and NPI 1306249958, issued on Sep 26, 2014. Check the license (California 1078313, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Oi Yi Tin-Mejia
- Credential
- MBA, MS, RD
- Primary taxonomy
- Registered Dietitian 133V00000X
- License number
- 1078313 CA
Self-reported in NPPES; status is on the state search - Practice location
- 224 E Hammel St, Monterey Park, CA 91755
- Phone
- (626) 319-8883
- Enumerated
- Sep 26, 2014
- Record last updated
- Mar 31, 2022
- Medicare enrollment
- Enrolled (PECOS I20250820002920); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest registered dietitian records → All 7,148 in California → Look up another NPI →
Verify Oi Yi Tin-Mejia in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 1078313Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Providence Medical InstituteGlendale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Oi Yi Tin-Mejia among 7,148 registered dietitian records in California
Oi Yi Tin-Mejia, MBA, MS, RD is one of 7,148 registered dietitian records with a practice address in California. 5% 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 32% of them.
- NPI issued2014 · 32% of these records are older, 65% newer
- In a Medicare fileYes · 5% of these records are
- In the CMS Doctors and Clinicians fileYes · 7% of these records are
- Graduated2019 · median 2014 among the 529 with a school on file
- Record last updated2022 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 133V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 registered dietitian records list a practice address in Monterey Park
They are 15 of the 948 NPPES records with a practice address in Monterey Park, and 7,148 registered dietitian records in California.
All 7,148 in California → Every provider in Monterey Park → Registered Dietitian nationwide →
The 8 registered dietitian records with the nearest ZIP codes
- Desiree AltamiranoMonterey Park, CA 917551376337345
- Lily Kwan, MBA, MS,RD, LD, LMNTMonterey Park, CA 917551487372728
- Jacqueline Lao, REGISTERED DIETITIANMonterey Park, CA 917551073707774
- Laura LuuMonterey Park, CA 917551245635713
- Haruna Suzuki, RDNMonterey Park, CA 917551114692787
- Cecilia Chan, RDMonterey Park, CA 917541205245883
- Annqi Jin Chen, RDNMonterey Park, CA 917541750232476
- Markita Lewis, MS, RDNMonterey Park, CA 917541780163949
Common questions
What is Oi Yi Tin-Mejia, MBA, MS, RD's NPI number?
Oi Yi Tin-Mejia, MBA, MS, RD's National Provider Identifier (NPI) is 1306249958, issued on Sep 26, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Oi Yi Tin-Mejia, MBA, MS, RD located?
The NPPES record lists a practice address at 224 E Hammel St, Monterey Park, CA, 91755. Phone: (626) 319-8883. Providers update this record themselves, so call before visiting.
How can I verify Oi Yi Tin-Mejia, MBA, MS, RD's license?
NPPES lists California license number 1078313, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.