Dr. Brian Nicholas Mason, DO
- Medicare services, 2024
- 245
- Medicare patients, 2024
- 235
- Part D claims, 2024
- 936
- Hospital affiliations
- 5
- Industry payments
- $18
- Practice address
- 2623 E Slauson Ave, Huntington Park, CA 90255
- Practice phone
- Call (323) 583-1931
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Brian Nicholas Mason is an internist in Huntington Park, California
Dr. Mason practices at Community Hospital of Huntington Park in Huntington Park, California, part of Pipeline Health System.
Dr. Mason's NPI, 1942889217, was assigned on April 5, 2021. Dr. Mason holds Tennessee license 5631.
- NPI
- 1942889217NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8729488572
- NPI enumeration date
- April 5, 2021
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (323) 583-1931
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Brian Nicholas Mason practices at Community Hospital of Huntington Park in Huntington Park, California
Dr. Mason's primary practice is Community Hospital of Huntington Park, at 2623 E Slauson Ave, Huntington Park, CA 90255 in Los Angeles County. The practice phone is (323) 583-1931.
- Community Hospital of Huntington Park2623 E Slauson Ave, Huntington Park, CA 90255 · Los Angeles CountyPhone(323) 583-1931
Source: Dmand AI Affiliation Data
Dr. Brian Nicholas Mason is affiliated with 5 sites of care and 4 medical groups
Dr. Mason's primary practice is Community Hospital of Huntington Park in Huntington Park, California, part of Pipeline Health System. Dr. Mason is also affiliated with Memorial Hospital of Gardena. The medical group on file is UCLA Medical Group. Dmand AI also links Dr. Mason to 3 more hospitals and 3 medical groups, 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. Brian Nicholas Mason's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mason practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Community Hospital of Huntington Park | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Brian Nicholas Mason is one of 16,751 internists in California
Internal medicine is Dr. Mason's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mason is licensed in Tennessee.
Specialties and state licenses
- Internal medicine, TennesseePrimary
Internists near Dr. Mason
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. Brian Nicholas Mason billed Medicare for 245 services in 2024
CMS data shows 245 Medicare services from Dr. Mason across 3 procedure codes in 2024, for 235 Medicare patients. Medicare paid $28,406 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mason compared with the California median for internists, 2024
- Dr. Mason
- California median
- Medicare services
- 245vs 36132% below
- Medicare patients
- 235vs 15156% above
- Part D claims
- 564vs 42134% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Mason'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. Mason and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Brian Nicholas Mason treated 235 Medicare patients in 2024, average age 76
CMS counts 235 Medicare patients who saw Dr. Mason in 2024. The largest group is 75 to 84, with 89 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 17% are also on Medicaid. Their average risk score is 2.21, 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. Mason's median patient age at 61, with 53% women.
Dr. Mason's Medicare patients by age, 2024
Dr. Mason's Medicare patients by sex, 2024
- Women12151%
- Men11449%
Chronic conditions among Dr. Mason's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis65%
- Chronic kidney disease57%
- Ischemic heart disease54%
- Diabetes51%
- Heart failure49%
- Atrial fibrillation36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mason's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Brian Nicholas Mason wrote 936 Medicare Part D claims in 2024
In 2024, Dr. Mason wrote 936 Medicare Part D claims for 148 patients. 87% of them were for generic drugs. CMS names the drug for 564 of them, across 28 drugs with 11 or more claims each, at $39,832 in total drug cost. In 2023, CMS named 817 claims across 38 drugs.
Dr. Mason's Part D claims by kind of drug, 2024
- Generic812 claims87%
- Brand-name and other124 claims13%
Dr. Mason'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8172024: 56431%
Drugs named by CMS: 28 in 2024, 38 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. Brian Nicholas Mason takes part in Medicare
Dr. Mason 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. Brian Nicholas Mason received $18 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Mason from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Mallinckrodt Hospital Products Inc. paid the most, $18.
Companies that paid Dr. Mason the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Brian Nicholas Mason'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) |
| 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. Brian Nicholas Mason
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. Brian Nicholas Mason's NPI number?
Dr. Brian Nicholas Mason's NPI number is 1942889217. It was assigned on April 5, 2021, and it is active in the NPI Registry.
What kind of doctor is Dr. Brian Nicholas Mason?
Dr. Brian Nicholas Mason is an internist in Huntington Park, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Brian Nicholas Mason practice?
Dr. Mason practices at 2623 E Slauson Ave, Huntington Park, CA 90255. Dr. Mason's primary practice is Community Hospital of Huntington Park in Huntington Park, California, part of Pipeline Health System. Dmand AI also links Dr. Mason to 3 hospitals and 3 medical groups.
What is Dr. Brian Nicholas Mason's office phone number?
The practice phone on file for Dr. Mason is (323) 583-1931.
What is Dr. Brian Nicholas Mason's medical license number?
Dr. Mason holds Tennessee license 5631.
Which hospitals is Dr. Brian Nicholas Mason affiliated with?
Dr. Mason practices at Community Hospital of Huntington Park in Huntington Park, California. Dr. Mason is also affiliated with Memorial Hospital of Gardena. Dmand AI links Dr. Mason to 3 more hospitals.
What medical group is Dr. Brian Nicholas Mason part of?
Dr. Mason is linked to UCLA Medical Group. Dmand AI links Dr. Mason to 3 more medical groups.
Does Dr. Brian Nicholas Mason accept Medicare?
Yes. CMS data shows Dr. Mason billed Medicare for 245 services in 2024, and Dr. Mason accepts Medicare assignment.
How many Medicare patients does Dr. Brian Nicholas Mason see?
CMS counts 235 Medicare patients who saw Dr. Mason in 2024, with an average age of 76.
What services does Dr. Brian Nicholas Mason bill to Medicare?
In 2024, Dr. Mason's most billed Medicare services were hospital inpatient care (99223), hospital inpatient care (99232) and hospital inpatient care (99238).
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What drugs does Dr. Brian Nicholas Mason prescribe most?
In 2024 Medicare Part D data, Dr. Mason's most prescribed drugs by claims were Atorvastatin Calcium, Metformin HCl ER and Gabapentin.
Has Dr. Brian Nicholas Mason received payments from drug or device companies?
CMS Open Payments shows $18 in general payments to Dr. Mason from 1 company from 2025 to 2025. The largest total came from Mallinckrodt Hospital Products Inc.
How long has Dr. Brian Nicholas Mason been practicing?
Dr. Mason graduated from medical school in 2020, 6 years ago.
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