Mark Stuart Simmons, MD
Internal Medicine Physician · Tuscon, AZ
Mark Stuart Simmons, MD is an internal medicine physician with a practice address in Tuscon, Arizona, and NPI 1811092760, issued on Sep 14, 2006. Check the license on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark Stuart Simmons
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 37923 CO
Self-reported in NPPES; status is on the state search - Practice location
- 3870 W. River RD, Tuscon, AZ 85741
- Phone
- (520) 219-6616
- Enumerated
- Sep 14, 2006
- Record last updated
- Sep 26, 2024
- Fax
- (970) 266-3660
- Medicaid ID
- 81353871 CO
- Medicare enrollment
- Enrolled (PECOS I20240716000330); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Verify Mark Stuart Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% more Medicare Part D claims than the average internal medicine physician in 2024
4,253 Medicare Part D claims for 536 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 76 claims were for opioids.
Most prescribed
- Atorvastatin Calcium451 claims
- Lisinopril236 claims
- Amlodipine Besylate220 claims
- Levothyroxine Sodium175 claims
- Meloxicam124 claims
- Metformin Hcl121 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: $20.43
1 payment: food and beverage; the largest payer was Abbvie 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 one group practice
- Northwest Urgent Care LLCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Stuart Simmons among 2,853 internal medicine physician records in Arizona
Mark Stuart Simmons, 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 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1992 · median 2003 among the 1,643 with a school on file
- Record last updated2024 · 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).
4 internal medicine physician records list a practice address in Tuscon
They are 4 of the 28 NPPES records with a practice address in Tuscon, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Tuscon → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Adam Boyer, MDTucson, AZ 857411760440317
- Patricia Carter, MDTucson, AZ 857411780688689
- David Gates, MDTucson, AZ 857411750346565
- Paul Gregory, MDTucson, AZ 857411255397790
- Terry Hargrove, MDTucson, AZ 857411336117092
- Jocelyn Hendricks, D.O.Tucson, AZ 857411497742068
- Brian Mayernick, MDTucson, AZ 857411114916384
- Rebecca Nara, M.D.Tucson, AZ 857411083602700
Common questions
What is Mark Stuart Simmons, MD's NPI number?
Mark Stuart Simmons, MD's National Provider Identifier (NPI) is 1811092760, issued on Sep 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stuart Simmons, MD located?
The NPPES record lists a practice address at 3870 W. River RD, Tuscon, AZ, 85741. Phone: (520) 219-6616. Providers update this record themselves, so call before visiting.
How can I verify Mark Stuart Simmons, MD's license?
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 Mark Stuart Simmons, MD prescribe under Medicare Part D?
In 2024, Mark Stuart Simmons, MD had 4,253 Medicare Part D claims for 536 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.