Dr. Stuart Alexander Chalfin, MD
- Medicare services, 2020
- 30,438
- Part D claims, 2024
- 18
- Publications
- 4
- Industry payments
- $19,570
- Affiliated sites
- 1
- Practice address
- 3791 Katella Ave Ste 200 Suite 200, Los Alamitos, CA 90720-2016
- Practice phone
- Call (562) 598-6166
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Associates In Urology
Surgical practice · Los Alamitos, California
Find Dr. Chalfin's professional email, personal email and mobile number
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Dr. Stuart Alexander Chalfin is a urologist in Duarte, California
Dr. Chalfin practices at Associates In Urology in Los Alamitos, California.
Dr. Chalfin's NPI, 1699871608, was assigned on September 16, 2006. Dr. Chalfin graduated from Cleveland Medical College, Homeopathic in 1976. Dr. Chalfin holds California license G34287.
- NPI
- 1699871608NPI Registry (opens in a new tab)
- NPI enumeration date
- September 16, 2006
- NPI status
- Active
- Practice phone
- (562) 598-6166
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stuart Alexander Chalfin practices in Los Alamitos and Duarte
Dr. Chalfin's primary practice is Associates in Urology, at 3791 Katella Ave Ste 200 Suite 200, Los Alamitos, CA 90720-2016. The practice phone is (562) 598-6166. The NPI Registry lists Dr. Chalfin's practice address as 1500 Duarte Rd, Duarte, CA 91010.
- Associates in UrologyPrimary3791 Katella Ave Ste 200 Suite 200, Los Alamitos, CA 90720-2016Phone(562) 598-6166
- NPI Registry address1500 Duarte Rd, Duarte, CA 91010 · Los Angeles CountyPhone(562) 598-6166
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Stuart Alexander Chalfin is affiliated with 1 site of care and 1 medical group
Dr. Chalfin's primary practice is Associates In Urology in Los Alamitos, California. Dmand AI also links Dr. Chalfin to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Stuart Alexander Chalfin's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chalfin practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Associates In Urology | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stuart Alexander Chalfin is one of 1,395 urologists in California
Urology is Dr. Chalfin's primary specialty in the NPI Registry, under taxonomy code 208800000X. Dr. Chalfin is board certified in urology by the American Board of Urology. Dmand AI has Dr. Chalfin's licenses on file in 2 states: California and Washington.
Specialties and state licenses
- Urology, CaliforniaPrimary
- Washington license
Urologists near Dr. Chalfin
Counts of urologists 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. Stuart Alexander Chalfin billed Medicare for 30,438 services in 2020
CMS data shows 30,438 Medicare services from Dr. Chalfin across 34 procedure codes in 2020. Medicare paid $278,105 for them.
Dr. Chalfin's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Drugs given in the office
- 2019: 10,8242020: 22,511108%
- Lab and pathology
- 2019: 6,9032020: 3,96443%
- Surgery
- 2019: 3,5192020: 1,97444%
- Office and hospital visits
- 2019: 3,0222020: 1,81240%
- Tests and treatments
- 2019: 1442020: 12414%
- Imaging
- 2019: 942020: 5344%
- Other services
- 2019: 242020: 0100%
Where Dr. Chalfin's Medicare services took place, 2020
- In an office30,413100%
- In a facility250%
Dr. Chalfin compared with the California median for urologists, 2020
- Dr. Chalfin
- California median
- Medicare services
- 30,438vs 1,05029.0 times
- Part D claims
- 276vs 64257% below
Medians across 1,310 urologists in California with Dmand AI profiles that report each measure.
Dr. Chalfin's most billed Medicare procedure codes, 2020
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. Chalfin?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chalfin and other urologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stuart Alexander Chalfin's patients have a median age of 73
Across all payers, Dmand AI patient panel data puts Dr. Chalfin's median patient age at 73, with 36% women.
Dr. Chalfin's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women36%
- Men62%
Source: Dmand AI Patient Panel Data
Dr. Stuart Alexander Chalfin wrote 18 Medicare Part D claims in 2024
In 2024, Dr. Chalfin wrote 18 Medicare Part D claims. 100% of them were for generic drugs. They cover 7 drugs, with $46,440 in total drug cost. In 2020, CMS named 2,358 claims across 37 drugs.
Dr. Chalfin's most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 2,3582021: 27688%
Drugs named by CMS: 7 in 2021, 37 in 2020.
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
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Dr. Stuart Alexander Chalfin has 4 publications on record
Dmand AI links 4 papers to Dr. Chalfin in 2016. Dr. Chalfin has published most often in J Urol. Dr. Chalfin's most frequent co-authors are Michael Scott Gazzaniga, MD, John Ravera, MD and Allan Shanberg, MD.
Dr. Chalfin's most frequent co-authors
- Michael Scott Gazzaniga, MD1 shared paper
- John Ravera, MD1 shared paper
- Allan Shanberg, MD1 shared paper
Recent publications by Dr. Chalfin
See who Dr. Chalfin researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chalfin works with, so you can find a warm path to the right urologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Stuart Alexander Chalfin received $19,570 in industry payments from 2016 to 2022
CMS Open Payments shows 194 general payments to Dr. Chalfin from 25 drug and device companies from 2016 to 2022. Consulting fees make up the largest share, 34% of the total. Medtronic USA, Inc. paid the most, $6,850.
General payments to Dr. Chalfin by program year, 2016 to 2022
General payments to Dr. Chalfin by kind, 2016 to 2022
- Consulting fees$6,67534%
- Food and beverage$5,63329%
- Travel and lodging$4,23222%
- Speaker and faculty fees$2,70014%
- Education$3302%
Companies that paid Dr. Chalfin the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stuart Alexander Chalfin has 1 award and honors on record
Dmand AI lists 1 award for Dr. Chalfin.
Awards and honors for Dr. Chalfin
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Stuart Alexander Chalfin graduated from Cleveland Medical College, Homeopathic
Dr. Chalfin graduated from Cleveland Medical College, Homeopathic in 1976. Dr. Chalfin is a member of ACS and SLS.
- Medical school
- Board certified in urology
Source: Dmand AI Professional Profile Data
Dr. Stuart Alexander Chalfin accepts plans from 1 insurance carrier
Dr. Chalfin is in network with 1 carrier, including Excellus BlueCross BlueShield. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
Plan types Dr. Chalfin accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Stuart Alexander Chalfin'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Stuart Alexander Chalfin
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. Stuart Alexander Chalfin's NPI number?
Dr. Stuart Alexander Chalfin's NPI number is 1699871608. It was assigned on September 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stuart Alexander Chalfin?
Dr. Stuart Alexander Chalfin is a urologist in Duarte, California. The primary specialty in the NPI Registry is Urology Physician (taxonomy code 208800000X).
Where does Dr. Stuart Alexander Chalfin practice?
Dr. Chalfin practices at 3791 Katella Ave Ste 200 Suite 200, Los Alamitos, CA 90720-2016. Dr. Chalfin also practices at 1500 Duarte Rd, Duarte, CA 91010. Dr. Chalfin's primary practice is Associates In Urology in Los Alamitos, California. Dmand AI also links Dr. Chalfin to 1 medical group.
What is Dr. Stuart Alexander Chalfin's office phone number?
The practice phone on file for Dr. Chalfin is (562) 598-6166.
What is Dr. Stuart Alexander Chalfin's medical license number?
Dr. Chalfin holds California license G34287, one of the licenses on file in 2 states.
Which states has Dr. Stuart Alexander Chalfin been licensed in?
Dmand AI has state licenses on file for Dr. Chalfin in California (1977 to 2027) and Washington (1993 to 2021).
Does Dr. Stuart Alexander Chalfin accept Medicare?
Yes. CMS data shows Dr. Chalfin billed Medicare for 30,438 services in 2020.
Is Dr. Stuart Alexander Chalfin board certified?
Yes. Dr. Chalfin is board certified in urology by the American Board of Urology.
What services does Dr. Stuart Alexander Chalfin bill to Medicare?
In 2020, Dr. Chalfin's most billed Medicare services were injected or infused drug (J1071), injected or infused drug (J3490) and lab and pathology test (81002).
Where did Dr. Stuart Alexander Chalfin go to medical school?
Dr. Chalfin graduated from Cleveland Medical College, Homeopathic in 1976.
Show 6 more questionsShow fewer questions
What drugs does Dr. Stuart Alexander Chalfin prescribe most?
In 2021 Medicare Part D data, Dr. Chalfin's most prescribed drugs by claims were Tamsulosin HCl, Finasteride and Myrbetriq.
Has Dr. Stuart Alexander Chalfin received payments from drug or device companies?
CMS Open Payments shows $19,570 in general payments to Dr. Chalfin from 25 companies from 2016 to 2022. The largest total came from Medtronic USA, Inc.
How long has Dr. Stuart Alexander Chalfin been practicing?
Dr. Chalfin graduated from medical school in 1976, 50 years ago.
Does Dr. Stuart Alexander Chalfin do research?
Dmand AI links 4 publications to Dr. Chalfin.
Who does Dr. Stuart Alexander Chalfin publish with?
Dr. Chalfin's most frequent co-authors are Michael Scott Gazzaniga, MD (1 shared paper), John Ravera, MD (1 shared paper) and Allan Shanberg, MD (1 shared paper).
What insurance does Dr. Stuart Alexander Chalfin accept?
Dr. Chalfin is in network with 1 carrier, including Excellus BlueCross BlueShield. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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