Peter Mathern, M.D.
Medical Oncology Internal Medicine
Peter Mathern is a Medical Oncology Internal Medicine specialist based in Flagstaff, AZ with over 36 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
With over 36 years in internal medicine, Peter Mathern, M.D. is a long-established medical oncology internal medicine specialist in Flagstaff. He has been practicing since 2006 — over 36 years. CMS Medicare data shows his patients commonly have hypertension, high cholesterol, and cancer. CMS MIPS quality score: 75/100 (2023).
At a glance
- Prescribes opioids less than 31% of reporting doctors in Arizona
- Federal MIPS score higher than 15% of MIPS-scored doctors in Arizona
- Virtual visits available — no app or travel required
Recent · 76dNPPES updated 2026-03-09 · verify NPI on CMS · Verify license at Arizona Medical Board
Contact & Location
Practice Location
77 W Forest Ave, Flagstaff, AZ 86001-1479
How Does This Doctor Compare?
Based on Medicare data, this doctor prescribes opioid pain medications conservatively.
MIPS Score
202375/100
Arizona avg: 77.5 · US avg: 83.6
⚠ Lower than most doctors nationally(-8.6 pts)
How the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Opioid Rx
↓ Lower = better2.65%
Arizona avg: 6.7 · US avg: 5.1
✓ Higher than most doctors nationally(-2.4 pts)
2.65% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better64.2%
Arizona avg: 84.7 · US avg: 82.8
⚠ Lower than most doctors nationally(-18.6 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
803
Unique beneficiaries
High volumePrescription Recipients
238
Patients prescribed
Prescriptions Written
1,359
Total claims
Total Medicare drug cost: $6.51M
Percentile rankings compared against 1,247 reporting peers in Arizona.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Cancer.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↓ Fewer patients than average (-11%) — less common here
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↓ Fewer patients than average (-11%) — less common here
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+37%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-12%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-8%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↓ Fewer patients than average (-8%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$3.0k received from industry
125 transactions reported in 2024 ·Moderate tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Peter Mathern's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Board certified · Mar 8, 2026
Self-reported via NPPES
36 years in practice
Senior practitioner
Medical oncologists diagnose and treat cancer using chemotherapy, immunotherapy, targeted therapy, and hormone therapy. They coordinate care with surgical oncologists and radiation oncologists for comprehensive cancer treatment.
Taxonomy: 207RX0202X
Mailing address
Po Box 749495, Atlanta, GA 30374-9495
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 100008
View hospital on Medicare Care CompareVirtual Medical Oncology Care With Peter Mathern
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Peter Mathern for blood pressure monitoring, cholesterol management, follow-up consultations — no travel to Flagstaff required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Peter Mathern
Dr. Mathern is listed as active in the NPI registry with telehealth listed in Flagstaff, AZ. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (928) 635-7307.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Peter Mathern
Practice Location
77 W Forest Ave, Flagstaff, AZ 86001-1479
Mailing Address
Po Box 749495, Atlanta, GA 30374-9495
This is a provider directory. Contact the office directly to schedule appointments.
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