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
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).
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 4 in Tuscon → All 2,853 in Arizona → Every provider in Tuscon →
Other internal medicine physician records in Arizona
- Daniel Aaronson, MDTucson, AZ1134865355
- Constantia Abarikwu, MDPhoenix, AZ1497832620
- Jaber Abawi, MDPayson, AZ1629038542
- Demsas Abay, MDPeoria, AZ1720312390
- Firas Abbas, M.D. M.P.H.Mesa, AZ1336481407
- Hassan Abbas, D.O.Mesa, AZ1477294775
- Jalal Abbas, M.D.Sun City West, AZ1205895034
- Tayeb Abbas, MDSun City West, AZ1093406795
- Hamed Abbaszadegan, MDPhoenix, AZ1407083579
- Kristopher Abbate, MDTucson, AZ1184112401
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.