Dr. Mark Stephen Walmer, MD
- Medicare services, 2024
- 15,314
- Medicare patients, 2024
- 697
- Part D claims, 2024
- 11,903
- Industry payments
- $1,357
- Affiliated sites
- 3
- Practice address
- 2081 W Frye Rd, Ste 200, Chandler, AZ 85224
- Practice phone
- Call (480) 821-3821
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
East Valley Internal Medicine
Clinical Lab - Full Service · Chandler, Arizona
Find Dr. Walmer's 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 Stephen Walmer is an internist in Chandler, Arizona
Dr. Walmer practices at East Valley Internal Medicine in Chandler, Arizona.
Dr. Walmer's NPI, 1629166053, was assigned on October 11, 2006. Dr. Walmer graduated from Medical University of South Carolina College of Medicine in 1984. Dr. Walmer holds Arizona license 15974.
- NPI
- 1629166053NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4486641347
- NPI enumeration date
- October 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (480) 821-3821
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Stephen Walmer practices at East Valley Internal Medicine in Chandler, Arizona
Dr. Walmer's primary practice is East Valley Internal Medicine, at 2081 W Frye Rd, Ste 200, Chandler, AZ 85224. The practice phone is (480) 821-3821.
- East Valley Internal Medicine2081 W Frye Rd, Ste 200, Chandler, AZ 85224Phone(480) 821-3821
Source: Dmand AI Affiliation Data
Dr. Mark Stephen Walmer is affiliated with 3 sites of care and 1 medical group
Dr. Walmer's primary practice is East Valley Internal Medicine in Chandler, Arizona. The medical group on file is East Valley Internal Medicine. Dmand AI also links Dr. Walmer to 1 more group practice or clinic and 1 home health agency, each named with a free account. Dr. Walmer's employer is on file too: a clinical lab.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Stephen Walmer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walmer practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| East Valley Internal Medicine | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Stephen Walmer is one of 2,420 internists in Arizona
Internal medicine is Dr. Walmer's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Walmer is licensed in Arizona.
Specialties and state licenses
- Internal medicine, ArizonaPrimary
Internists near Dr. Walmer
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 Stephen Walmer billed Medicare for 15,314 services in 2024
CMS data shows 15,314 Medicare services from Dr. Walmer across 43 procedure codes in 2024, for 697 Medicare patients. Medicare paid $421,180 for them. Every service was in an office.
Dr. Walmer's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 8,1482024: 8,4944%
- Office and hospital visits
- 2023: 3,6872024: 3,22513%
- Surgery
- 2023: 1,4792024: 1,482No change
- Other services
- 2023: 9672024: 1,10314%
- Tests and treatments
- 2023: 8372024: 72214%
- Imaging
- 2023: 1982024: 28845%
Dr. Walmer compared with the Arizona median for internists, 2024
- Dr. Walmer
- Arizona median
- Medicare services
- 15,314vs 47632.2 times
- Medicare patients
- 697vs 2053.4 times
- Part D claims
- 11,079vs 26042.6 times
Medians across 2,300 internists in Arizona with Dmand AI profiles that report each measure.
Dr. Walmer's 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Walmer and other internists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Stephen Walmer treated 697 Medicare patients in 2024, average age 76
CMS counts 697 Medicare patients who saw Dr. Walmer in 2024. The largest group is 75 to 84, with 323 patients. 75% of them have high cholesterol, and 74% have high blood pressure. Their average risk score is 1.07, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walmer's median patient age at 67, with 44% women.
Dr. Walmer's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Walmer's Medicare patients by sex, 2024
- Women30944%
- Men38856%
Chronic conditions among Dr. Walmer's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis54%
- Ischemic heart disease31%
- Diabetes29%
- Anxiety22%
- Chronic kidney disease21%
- Atrial fibrillation20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walmer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women44%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Stephen Walmer wrote 11,903 Medicare Part D claims in 2024
In 2024, Dr. Walmer wrote 11,903 Medicare Part D claims for 978 patients. 90% of them were for generic drugs. CMS names the drug for 11,079 of them, across 157 drugs with 11 or more claims each, at $630,105 in total drug cost. In 2023, CMS named 10,816 claims across 150 drugs.
Dr. Walmer's Part D claims by kind of drug, 2024
- Generic10,722 claims90%
- Brand-name1,134 claims10%
- Other47 claims0%
Dr. Walmer's 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. Walmer's Part D claims, 2024
- Opioids2%284 of 11,903 claims
- Antibiotics2%251 of 11,903 claims
- Antipsychotics, patients 65 and over0%39 of 11,903 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: 10,8162024: 11,0792%
Drugs named by CMS: 157 in 2024, 150 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
Dr. Mark Stephen Walmer offers telehealth to Medicare patients
Dr. Walmer accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Walmer as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark Stephen Walmer received $1,357 in industry payments from 2016 to 2020
CMS Open Payments shows 100 general payments to Dr. Walmer from 21 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $204.
General payments to Dr. Walmer by program year, 2016 to 2020
Companies that paid Dr. Walmer the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Stephen Walmer graduated from Medical University of South Carolina College of Medicine
Dr. Walmer graduated from Medical University of South Carolina College of Medicine in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Stephen Walmer'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) |
| Training, board certification and memberships | Dmand AI Professional Profile 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 Stephen Walmer
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 Stephen Walmer's NPI number?
Dr. Mark Stephen Walmer's NPI number is 1629166053. It was assigned on October 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Stephen Walmer?
Dr. Mark Stephen Walmer is an internist in Chandler, Arizona. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Stephen Walmer practice?
Dr. Walmer practices at 2081 W Frye Rd, Ste 200, Chandler, AZ 85224. Dr. Walmer's primary practice is East Valley Internal Medicine in Chandler, Arizona. Dmand AI also links Dr. Walmer to 1 group practice or clinic and 1 home health agency.
What is Dr. Mark Stephen Walmer's office phone number?
The practice phone on file for Dr. Walmer is (480) 821-3821.
What is Dr. Mark Stephen Walmer's medical license number?
Dr. Walmer holds Arizona license 15974.
What medical group is Dr. Mark Stephen Walmer part of?
Dr. Walmer is linked to East Valley Internal Medicine.
Does Dr. Mark Stephen Walmer accept Medicare?
Yes. CMS data shows Dr. Walmer billed Medicare for 15,314 services in 2024, and Dr. Walmer accepts Medicare assignment.
Does Dr. Mark Stephen Walmer offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Walmer as offering telehealth services.
How many Medicare patients does Dr. Mark Stephen Walmer see?
CMS counts 697 Medicare patients who saw Dr. Walmer in 2024, with an average age of 76.
What services does Dr. Mark Stephen Walmer bill to Medicare?
In 2024, Dr. Walmer's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and lab and pathology test (80053).
Show 4 more questionsShow fewer questions
Where did Dr. Mark Stephen Walmer go to medical school?
Dr. Walmer graduated from Medical University of South Carolina College of Medicine in 1984.
What drugs does Dr. Mark Stephen Walmer prescribe most?
In 2024 Medicare Part D data, Dr. Walmer's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Lisinopril.
Has Dr. Mark Stephen Walmer received payments from drug or device companies?
CMS Open Payments shows $1,357 in general payments to Dr. Walmer from 21 companies from 2016 to 2020. The largest total came from Pfizer Inc.
How long has Dr. Mark Stephen Walmer been practicing?
Dr. Walmer graduated from medical school in 1984, 42 years ago.
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