Mei Lai So, MD
Internal Medicine Physician · Tucson, AZ
Mei Lai So, MD is an internal medicine physician with a practice address in Tucson, Arizona, and NPI 1669935441, issued on Apr 9, 2019. Check the license (Arizona 65443, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mei Lai So
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 65443 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 6236 E Pima St Ste 100, Tucson, AZ 85712
- Phone
- (520) 327-6874
- Enumerated
- Apr 9, 2019
- Record last updated
- Jun 19, 2026
- Fax
- (520) 327-0028
- Medicare enrollment
- Enrolled (PECOS I20220830003924); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 2019
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 6236 E Pima St Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Juan Bautista, M.D.Family Medicine Physician1619255007
- Laura Kennicutt, FNP-CFamily Nurse Practitioner1730646431
- Dustin Morris, MDFamily Medicine Physician1396721403
- Kayvaan Mortazavi, MDFamily Medicine Physician1124265285
- Rosanna Nicoletti, MDFamily Medicine Physician1013927607
- Gerald Roth, DOFamily Medicine Physician1255490322
Verify Mei Lai So in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 65443Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
243 Medicare Part D claims for 86 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Oxycodone Hcl14 claims
- Pantoprazole Sodium11 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): 97.6 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: $121.83
1 payment: food and beverage; the largest payer was Gilead Sciences, Inc. 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 2 group practices
- Arizona Community Physicians PCTucson, AZ
- Banner-University Medical GroupTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mei Lai So among 2,853 internal medicine physician records in Arizona
Mei Lai So, MD is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 79% of them.
- NPI issued2019 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2019 · median 2003 among the 1,643 with a school on file
- Record last updated2026 · 51% 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 Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
651 internal medicine physician records list a practice address in Tucson
They are 651 of the 18,788 NPPES records with a practice address in Tucson, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Tucson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Abraham, MDTucson, AZ 857121669468195
- Sheela Bhat, M.D.Tucson, AZ 857121598752008
- Muralikrishna Bhat, M.D.Tucson, AZ 857121114914637
- Douglas Bischoff, M.D.Tucson, AZ 857121821085333
- George Haloftis, D.O.Tucson, AZ 857121740277268
- Thomas Headlee, M.D.Tucson, AZ 857121194711630
- Kathleen Iveson, M.D.Tucson, AZ 857121720074263
- Gerome Kantor, MDTucson, AZ 857121407850290
Common questions
What is Mei Lai So, MD's NPI number?
Mei Lai So, MD's National Provider Identifier (NPI) is 1669935441, issued on Apr 9, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Mei Lai So, MD located?
The NPPES record lists a practice address at 6236 E Pima St Ste 100, Tucson, AZ, 85712. Phone: (520) 327-6874. Providers update this record themselves, so call before visiting.
How can I verify Mei Lai So, MD's license?
NPPES lists Arizona license number 65443, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mei Lai So, MD prescribe under Medicare Part D?
In 2024, Mei Lai So, MD had 243 Medicare Part D claims for 86 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mei Lai So, MD's MIPS final score?
The 2023 MIPS final score is 97.6 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.