Dr. Fredric Stewart Sirkis, MD
- Medicare services, 2024
- 46
- Medicare patients, 2024
- 47
- Part D claims, 2024
- 1,660
- Hospital affiliations
- 1
- Industry payments
- $1,349
- Practice address
- 1798 N Garey Ave, Pomona, CA 91767
- Practice phone
- Call (909) 865-9500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Sirkis' 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. Fredric Stewart Sirkis is an internist in Pomona, California
Dr. Sirkis practices at Pomona Valley Hospital Medical Center in Pomona, California, part of Pomona Valley Hospital Medical Center.
Dr. Sirkis' NPI, 1649356247, was assigned on October 27, 2006. Dr. Sirkis graduated from University of Maryland School of Medicine in 1978. Dr. Sirkis holds Maryland license D0022645.
- NPI
- 1649356247NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9234114760
- NPI enumeration date
- October 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 865-9500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Fredric Stewart Sirkis practices at Pomona Valley Hospital Medical Center in Pomona, California
Dr. Sirkis' primary practice is Pomona Valley Hospital Medical Center, at 1798 N Garey Ave, Pomona, CA 91767 in Los Angeles County. The practice phone is (909) 865-9500.
- Pomona Valley Hospital Medical Center1798 N Garey Ave, Pomona, CA 91767 · Los Angeles CountyPhone(909) 865-9500
Source: Dmand AI Affiliation Data
Dr. Fredric Stewart Sirkis is affiliated with 3 sites of care and 1 medical group
Dr. Sirkis' primary practice is Pomona Valley Hospital Medical Center in Pomona, California, part of Pomona Valley Hospital Medical Center. The medical group on file is Mercy Family Care Physicians. Dmand AI also links Dr. Sirkis to 1 more group practice or clinic and 1 skilled nursing facility, 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. Fredric Stewart Sirkis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sirkis practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pomona Valley Hospital Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Pomona Valley Hospital Medical Center and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Fredric Stewart Sirkis is one of 16,751 internists in California
Internal medicine is Dr. Sirkis' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Sirkis is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
Internists near Dr. Sirkis
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. Fredric Stewart Sirkis billed Medicare for 46 services in 2024
CMS data shows 46 Medicare services from Dr. Sirkis across 2 procedure codes in 2024, for 47 Medicare patients. Medicare paid $2,537 for them. Every service was in an office.
Dr. Sirkis' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5512024: 4692%
Dr. Sirkis compared with the California median for internists, 2024
- Dr. Sirkis
- California median
- Medicare services
- 46vs 36187% below
- Medicare patients
- 47vs 15169% below
- Part D claims
- 1,350vs 4213.2 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Sirkis' 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. Sirkis?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Sirkis and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Fredric Stewart Sirkis treated 47 Medicare patients in 2024, average age 86
CMS counts 47 Medicare patients who saw Dr. Sirkis in 2024. The largest group is 85 and over, with 28 patients. 75% of them have arthritis, and 75% have depression. 66% are also on Medicaid. Their average risk score is 2.63, 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. Sirkis' median patient age at 84, with 64% women.
Dr. Sirkis' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Sirkis' Medicare patients, 2024
- Arthritis75%
- Depression75%
- High blood pressure75%
- Mood disorders75%
- High cholesterol70%
- Alzheimer's and dementia66%
- Anxiety62%
- Ischemic heart disease47%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sirkis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 84
Patient panel by sex, all payers
- Women64%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Fredric Stewart Sirkis wrote 1,660 Medicare Part D claims in 2024
In 2024, Dr. Sirkis wrote 1,660 Medicare Part D claims for 130 patients. 87% of them were for generic drugs. CMS names the drug for 1,350 of them, across 45 drugs with 11 or more claims each, at $110,497 in total drug cost. In 2023, CMS named 2,921 claims across 79 drugs.
Dr. Sirkis' Part D claims by kind of drug, 2024
- Generic1,450 claims87%
- Brand-name and other210 claims13%
Dr. Sirkis' 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. Sirkis' Part D claims, 2024
- Antibiotics1%14 of 1,660 claims
- Antipsychotics, patients 65 and over2%28 of 1,660 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: 2,9212024: 1,35054%
Drugs named by CMS: 45 in 2024, 79 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. Fredric Stewart Sirkis takes part in Medicare
Dr. Sirkis 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)
For MedTech and pharma teams
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Dr. Fredric Stewart Sirkis received $1,349 in industry payments from 2016 to 2019
CMS Open Payments shows 95 general payments to Dr. Sirkis from 12 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 96% of the total. Janssen Pharmaceuticals, Inc paid the most, $436.
General payments to Dr. Sirkis by program year, 2016 to 2019
General payments to Dr. Sirkis by kind, 2016 to 2019
- Food and beverage$1,29796%
- Education$524%
Companies that paid Dr. Sirkis the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Fredric Stewart Sirkis graduated from University of Maryland School of Medicine
Dr. Sirkis graduated from University of Maryland School of Medicine in 1978.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Fredric Stewart Sirkis'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. Fredric Stewart Sirkis
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. Fredric Stewart Sirkis' NPI number?
Dr. Fredric Stewart Sirkis' NPI number is 1649356247. It was assigned on October 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Fredric Stewart Sirkis?
Dr. Fredric Stewart Sirkis is an internist in Pomona, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Fredric Stewart Sirkis practice?
Dr. Sirkis practices at 1798 N Garey Ave, Pomona, CA 91767. Dr. Sirkis' primary practice is Pomona Valley Hospital Medical Center in Pomona, California, part of Pomona Valley Hospital Medical Center. Dmand AI also links Dr. Sirkis to 1 group practice or clinic and 1 skilled nursing facility.
What is Dr. Fredric Stewart Sirkis' office phone number?
The practice phone on file for Dr. Sirkis is (909) 865-9500.
What is Dr. Fredric Stewart Sirkis' medical license number?
Dr. Sirkis holds Maryland license D0022645.
Which hospitals is Dr. Fredric Stewart Sirkis affiliated with?
Dr. Sirkis practices at Pomona Valley Hospital Medical Center in Pomona, California.
What medical group is Dr. Fredric Stewart Sirkis part of?
Dr. Sirkis is linked to Mercy Family Care Physicians.
Does Dr. Fredric Stewart Sirkis accept Medicare?
Yes. CMS data shows Dr. Sirkis billed Medicare for 46 services in 2024, and Dr. Sirkis accepts Medicare assignment.
How many Medicare patients does Dr. Fredric Stewart Sirkis see?
CMS counts 47 Medicare patients who saw Dr. Sirkis in 2024, with an average age of 86.
What services does Dr. Fredric Stewart Sirkis bill to Medicare?
In 2024, Dr. Sirkis' most billed Medicare services were nursing facility care (99308) and nursing facility care (99309).
Show 4 more questionsShow fewer questions
Where did Dr. Fredric Stewart Sirkis go to medical school?
Dr. Sirkis graduated from University of Maryland School of Medicine in 1978.
What drugs does Dr. Fredric Stewart Sirkis prescribe most?
In 2024 Medicare Part D data, Dr. Sirkis' most prescribed drugs by claims were Eliquis, Pantoprazole Sodium and Levothyroxine Sodium.
Has Dr. Fredric Stewart Sirkis received payments from drug or device companies?
CMS Open Payments shows $1,349 in general payments to Dr. Sirkis from 12 companies from 2016 to 2019. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Fredric Stewart Sirkis been practicing?
Dr. Sirkis graduated from medical school in 1978, 48 years ago.
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