Dr. Miles Rudyard Maassen, DO
- Medicare services, 2024
- 331
- Medicare patients, 2024
- 269
- Part D claims, 2024
- 89
- Hospital affiliations
- 2
- Industry payments
- $35
- Practice address
- 300 Hillmont Avenue, Ventura, CA 93003
- Practice phone
- Call (805) 652-6075
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Maassen's professional email, personal email and mobile number
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Dr. Miles Rudyard Maassen is an emergency medicine physician in Ventura, California
Dr. Maassen practices at Ventura County Medical Center in Ventura, California, part of Ventura County Health Care Agency.
Dr. Maassen's NPI, 1598320483, was assigned on May 6, 2019. Dr. Maassen graduated from Arizona College of Osteopathic Medicine Mid Western University in 2019. Dr. Maassen holds California license 20A19760.
- NPI
- 1598320483NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971984816
- NPI enumeration date
- May 6, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 652-6075
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Miles Rudyard Maassen practices at Ventura County Medical Center in Ventura, California
Dr. Maassen's primary practice is Ventura County Medical Center, at 300 Hillmont Avenue, Ventura, CA 93003 in Ventura County. The practice phone is (805) 652-6075.
- Ventura County Medical Center300 Hillmont Avenue, Ventura, CA 93003 · Ventura CountyPhone(805) 652-6075
Source: Dmand AI Affiliation Data
Dr. Miles Rudyard Maassen is affiliated with 3 sites of care and 3 medical groups
Dr. Maassen's primary practice is Ventura County Medical Center in Ventura, California, part of Ventura County Health Care Agency. Dr. Maassen is also affiliated with Community Memorial Hospital - Ojai. The medical group on file is Seaside Emergency Associates. Dmand AI also links Dr. Maassen to 2 more medical groups and 1 therapy and rehab clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Miles Rudyard Maassen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Maassen practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ventura County Medical Center | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Ventura County Health Care Agency and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Miles Rudyard Maassen is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Maassen's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Maassen is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Maassen
Counts of emergency medicine physicians 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. Miles Rudyard Maassen billed Medicare for 331 services in 2024
CMS data shows 331 Medicare services from Dr. Maassen across 6 procedure codes in 2024, for 269 Medicare patients. Medicare paid $30,866 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Maassen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3152024: 27712%
- Tests and treatments
- 2023: 582024: 547%
Dr. Maassen compared with the California median for emergency medicine physicians, 2024
- Dr. Maassen
- California median
- Medicare services
- 331vs 26525% above
- Medicare patients
- 269vs 24311% above
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Maassen'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. Maassen and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Miles Rudyard Maassen treated 269 Medicare patients in 2024, average age 73
CMS counts 269 Medicare patients who saw Dr. Maassen in 2024. The largest group is 65 to 74, with 97 patients. 75% of them have high blood pressure, and 74% have high cholesterol. 49% are also on Medicaid. Their average risk score is 1.84, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Maassen's median patient age at 37, with 51% women.
Dr. Maassen's Medicare patients by age, 2024
Dr. Maassen's Medicare patients by sex, 2024
- Women14554%
- Men12446%
Chronic conditions among Dr. Maassen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol74%
- Arthritis54%
- Mood disorders46%
- Anxiety42%
- Depression39%
- Diabetes35%
- Chronic kidney disease33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Maassen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 37
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Miles Rudyard Maassen wrote 89 Medicare Part D claims in 2024
In 2024, Dr. Maassen wrote 89 Medicare Part D claims for 66 patients. 96% of them were for generic drugs.
Dr. Maassen's Part D claims by kind of drug, 2024
- Generic85 claims96%
- Brand-name and other4 claims4%
Drug classes CMS tracks in Dr. Maassen's Part D claims, 2024
- Antibiotics51%45 of 89 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Miles Rudyard Maassen takes part in Medicare
Dr. Maassen 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. Miles Rudyard Maassen received $35 in industry payments in 2022
CMS Open Payments shows 2 general payments to Dr. Maassen from 1 drug or device company in 2022. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $35.
Companies that paid Dr. Maassen the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Miles Rudyard Maassen graduated from Arizona College of Osteopathic Medicine Mid Western University
Dr. Maassen graduated from Arizona College of Osteopathic Medicine Mid Western University in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Miles Rudyard Maassen'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 (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. Miles Rudyard Maassen
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. Miles Rudyard Maassen's NPI number?
Dr. Miles Rudyard Maassen's NPI number is 1598320483. It was assigned on May 6, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Miles Rudyard Maassen?
Dr. Miles Rudyard Maassen is an emergency medicine physician in Ventura, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Miles Rudyard Maassen practice?
Dr. Maassen practices at 300 Hillmont Avenue, Ventura, CA 93003. Dr. Maassen's primary practice is Ventura County Medical Center in Ventura, California, part of Ventura County Health Care Agency. Dmand AI also links Dr. Maassen to 2 medical groups and 1 therapy and rehab clinic.
What is Dr. Miles Rudyard Maassen's office phone number?
The practice phone on file for Dr. Maassen is (805) 652-6075.
What is Dr. Miles Rudyard Maassen's medical license number?
Dr. Maassen holds California license 20A19760.
Which hospitals is Dr. Miles Rudyard Maassen affiliated with?
Dr. Maassen practices at Ventura County Medical Center in Ventura, California. Dr. Maassen is also affiliated with Community Memorial Hospital - Ojai.
What medical group is Dr. Miles Rudyard Maassen part of?
Dr. Maassen is linked to Seaside Emergency Associates. Dmand AI links Dr. Maassen to 2 more medical groups.
Does Dr. Miles Rudyard Maassen accept Medicare?
Yes. CMS data shows Dr. Maassen billed Medicare for 331 services in 2024, and Dr. Maassen accepts Medicare assignment.
How many Medicare patients does Dr. Miles Rudyard Maassen see?
CMS counts 269 Medicare patients who saw Dr. Maassen in 2024, with an average age of 73.
What services does Dr. Miles Rudyard Maassen bill to Medicare?
In 2024, Dr. Maassen's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and heart test or procedure (93010).
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Where did Dr. Miles Rudyard Maassen go to medical school?
Dr. Maassen graduated from Arizona College of Osteopathic Medicine Mid Western University in 2019.
Has Dr. Miles Rudyard Maassen received payments from drug or device companies?
CMS Open Payments shows $35 in general payments to Dr. Maassen from 1 company from 2022 to 2022. The largest total came from Abbvie Inc.
How long has Dr. Miles Rudyard Maassen been practicing?
Dr. Maassen graduated from medical school in 2019, 7 years ago.
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