Dr. Mark Stuart Simmons, MD
- Medicare services, 2024
- 424
- Medicare patients, 2024
- 310
- Part D claims, 2024
- 4,253
- Hospital affiliations
- 1
- Industry payments
- $101
- Practice address
- 3870 W River Rd, Tucson, AZ 85741
- Practice phone
- Call (407) 602-1100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northwest Urgent Care at Orange Grove
Urgent Care Center · Tucson, Arizona
Find Dr. Simmons' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark Stuart Simmons is an internist in Tucson, Arizona
Dr. Simmons practices at Northwest Urgent Care at Orange Grove in Tucson, Arizona.
Dr. Simmons' NPI, 1811092760, was assigned on September 14, 2006. Dr. Simmons graduated from University of Kansas School of Medicine in 1992. Dr. Simmons' Colorado license number on file is 37923.
- NPI
- 1811092760NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830164144
- NPI enumeration date
- September 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (407) 602-1100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Stuart Simmons practices at Northwest Urgent Care at Orange Grove in Tucson, Arizona
Dr. Simmons' primary practice is Northwest Urgent Care at Orange Grove, at 3870 W River Rd, Tucson, AZ 85741. The practice phone is (407) 602-1100.
- Northwest Urgent Care at Orange Grove3870 W River Rd, Tucson, AZ 85741Phone(407) 602-1100
Source: Dmand AI Affiliation Data
Dr. Mark Stuart Simmons is affiliated with 2 sites of care and 2 medical groups
Dr. Simmons' primary practice is Northwest Urgent Care at Orange Grove in Tucson, Arizona. Dr. Simmons is also affiliated with Northwest Medical Center. The medical group on file is Northwest Urgent Care. Dmand AI also links Dr. Simmons to 1 more medical group, named with a free account. Dr. Simmons' employer is on file too: an urgent care center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Stuart Simmons' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simmons practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwest Urgent Care at Orange Grove | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Stuart Simmons is one of 2,420 internists in Arizona
Internal medicine is Dr. Simmons' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Simmons is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Simmons' licenses on file in 2 states: Colorado and Arizona.
Specialties and state licenses
- Internal medicine, ColoradoPrimary
- Arizona license
Clinical focus
Dmand AI lists acid reflux, acute mini-stroke (TIA), acute sinusitis, acute skin infection, aneurysm, anxiety, arthritis and asthma among the conditions Dr. Simmons treats.
Internists near Dr. Simmons
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Stuart Simmons billed Medicare for 424 services in 2024
CMS data shows 424 Medicare services from Dr. Simmons across 6 procedure codes in 2024, for 310 Medicare patients. Medicare paid $20,293 for them. Every service was in an office.
Dr. Simmons' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4192024: 32622%
- Other services
- 2023: 2952024: 6977%
- Lab and pathology
- 2023: 02024: 29
- Tests and treatments
- 2023: 832024: 0100%
Dr. Simmons compared with the Arizona median for internists, 2024
- Dr. Simmons
- Arizona median
- Medicare services
- 424vs 47611% below
- Medicare patients
- 310vs 20551% above
- Part D claims
- 3,685vs 26014.2 times
Medians across 2,300 internists in Arizona with Dmand AI profiles that report each measure.
Dr. Simmons' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Simmons?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Simmons and other internists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Stuart Simmons treated 310 Medicare patients in 2024, average age 75
CMS counts 310 Medicare patients who saw Dr. Simmons in 2024. The largest group is 65 to 74, with 162 patients. 75% of them have high cholesterol, and 64% have high blood pressure. Their average risk score is 1.03, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Simmons' median patient age at 48, with 54% women.
Dr. Simmons' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Simmons' Medicare patients by sex, 2024
- Women16252%
- Men14848%
Chronic conditions among Dr. Simmons' Medicare patients, 2024
- High cholesterol75%
- High blood pressure64%
- Arthritis47%
- Chronic kidney disease22%
- Ischemic heart disease21%
- Diabetes20%
- Mood disorders19%
- Depression18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Simmons' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Stuart Simmons wrote 4,253 Medicare Part D claims in 2024
In 2024, Dr. Simmons wrote 4,253 Medicare Part D claims for 536 patients. 90% of them were for generic drugs. CMS names the drug for 3,685 of them, across 82 drugs with 11 or more claims each, at $180,084 in total drug cost. In 2023, CMS named 4,833 claims across 94 drugs.
Dr. Simmons' Part D claims by kind of drug, 2024
- Generic3,838 claims90%
- Brand-name387 claims9%
- Other28 claims1%
Dr. Simmons' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Simmons' Part D claims, 2024
- Opioids2%76 of 4,253 claims
- Antibiotics4%189 of 4,253 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4,8332024: 3,68524%
Drugs named by CMS: 82 in 2024, 94 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Mark Stuart Simmons takes part in Medicare
Dr. Simmons accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark Stuart Simmons received $101 in industry payments from 2016 to 2024
CMS Open Payments shows 7 general payments to Dr. Simmons from 5 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $29.
General payments to Dr. Simmons by program year, 2016 to 2024
Companies that paid Dr. Simmons the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Stuart Simmons has 1 award and honors on record
Dmand AI lists 1 award for Dr. Simmons, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Simmons
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Mark Stuart Simmons graduated from University of Kansas School of Medicine
Dr. Simmons graduated from University of Kansas School of Medicine in 1992.
- Medical school
- Board certified in internal medicine
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Mark Stuart Simmons accepts plans from 12 insurance carriers
Dr. Simmons is in network with 12 carriers, including Aetna, United Healthcare and Cigna. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Cigna
- Elevance
- Blue Cross Blue Shield of Michigan
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +4 more carriersWith a free account
Plan types Dr. Simmons accepts, by number of carriers
- PPO11
- Medicare8
- POS6
- HMO4
- EPO2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark Stuart Simmons's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark Stuart Simmons
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark Stuart Simmons' NPI number?
Dr. Mark Stuart Simmons' NPI number is 1811092760. It was assigned on September 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Stuart Simmons?
Dr. Mark Stuart Simmons is an internist in Tucson, Arizona. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Stuart Simmons practice?
Dr. Simmons practices at 3870 W River Rd, Tucson, AZ 85741. Dr. Simmons' primary practice is Northwest Urgent Care at Orange Grove in Tucson, Arizona. Dmand AI also links Dr. Simmons to 1 medical group.
What is Dr. Mark Stuart Simmons' office phone number?
The practice phone on file for Dr. Simmons is (407) 602-1100.
What is Dr. Mark Stuart Simmons' medical license number?
Dr. Simmons' Colorado license number on file is 37923, one of the licenses on file in 2 states.
Which states has Dr. Mark Stuart Simmons been licensed in?
Dmand AI has state licenses on file for Dr. Simmons in Colorado (1999 to 2025) and Arizona (2024 to 2026).
Which hospitals is Dr. Mark Stuart Simmons affiliated with?
Dr. Simmons is affiliated with Northwest Medical Center.
What medical group is Dr. Mark Stuart Simmons part of?
Dr. Simmons is linked to Northwest Urgent Care. Dmand AI links Dr. Simmons to 1 more medical group.
Does Dr. Mark Stuart Simmons accept Medicare?
Yes. CMS data shows Dr. Simmons billed Medicare for 424 services in 2024, and Dr. Simmons accepts Medicare assignment.
How many Medicare patients does Dr. Mark Stuart Simmons see?
CMS counts 310 Medicare patients who saw Dr. Simmons in 2024, with an average age of 75.
Show 7 more questionsShow fewer questions
Is Dr. Mark Stuart Simmons board certified?
Yes. Dr. Simmons is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Mark Stuart Simmons bill to Medicare?
In 2024, Dr. Simmons' most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and medicare service (G0439).
Where did Dr. Mark Stuart Simmons go to medical school?
Dr. Simmons graduated from University of Kansas School of Medicine in 1992.
What drugs does Dr. Mark Stuart Simmons prescribe most?
In 2024 Medicare Part D data, Dr. Simmons' most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Amlodipine Besylate.
Has Dr. Mark Stuart Simmons received payments from drug or device companies?
CMS Open Payments shows $101 in general payments to Dr. Simmons from 5 companies from 2016 to 2024. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Mark Stuart Simmons been practicing?
Dr. Simmons graduated from medical school in 1992, 34 years ago.
What insurance does Dr. Mark Stuart Simmons accept?
Dr. Simmons is in network with 12 carriers, including Aetna, United Healthcare and Cigna. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
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