Dr. Ata Mazaheri, MD
- Medicare services, 2024
- 407
- Medicare patients, 2024
- 121
- Hospital affiliations
- 2
- Industry payments
- $9,879
- Insurance carriers
- 7
- Practice address
- 4101 Torrance Blvd, Torrance, CA 90503
- Practice phone
- Call (310) 540-7676
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Mazaheri's 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. Ata Mazaheri is a general surgeon in Torrance, California
Dr. Mazaheri practices at Providence Little Company of Mary Medical Center Torrance in Torrance, California, part of Providence Health & Services.
Dr. Mazaheri's NPI, 1164467239, was assigned on June 20, 2006. Dr. Mazaheri graduated from Royal College of Surgeons Ireland in 2000. Dr. Mazaheri holds California license A79930.
- NPI
- 1164467239NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496786576
- NPI enumeration date
- June 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 540-7676
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ata Mazaheri practices at Providence Little Company of Mary Medical Center Torrance in Torrance, California
Dr. Mazaheri's primary practice is Providence Little Company of Mary Medical Center Torrance, at 4101 Torrance Blvd, Torrance, CA 90503 in Los Angeles County. The practice phone is (310) 540-7676.
- Providence Little Company of Mary Medical Center Torrance4101 Torrance Blvd, Torrance, CA 90503 · Los Angeles CountyPhone(310) 540-7676
Source: Dmand AI Affiliation Data
Dr. Ata Mazaheri is affiliated with 3 sites of care
Dr. Mazaheri's primary practice is Providence Little Company of Mary Medical Center Torrance in Torrance, California, part of Providence Health & Services. Dr. Mazaheri is also affiliated with Torrance Memorial Medical Center. Dmand AI also links Dr. Mazaheri to 1 more physician office, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ata Mazaheri's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mazaheri practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence Little Company of Mary Medical Center Torrance | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ata Mazaheri is one of 2,926 general surgeons in California
Surgery is Dr. Mazaheri's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Mazaheri is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Mazaheri's licenses on file in 2 states: California and Illinois.
Specialties and state licenses
- Surgery, CaliforniaPrimary
- Illinois license
Clinical focus
Dmand AI lists abdominal adhesion surgery, colon removal and gallbladder removal among the conditions Dr. Mazaheri treats.
General surgeons near Dr. Mazaheri
Counts of general surgeons 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. Ata Mazaheri billed Medicare for 407 services in 2024
CMS data shows 407 Medicare services from Dr. Mazaheri across 4 procedure codes in 2024, for 121 Medicare patients. Medicare paid $47,838 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mazaheri's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6422024: 39139%
- Surgery
- 2023: 162024: 16No change
Dr. Mazaheri compared with the California median for general surgeons, 2024
- Dr. Mazaheri
- California median
- Medicare services
- 407vs 1662.5 times
- Medicare patients
- 121vs 121Close to median
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Mazaheri'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.
Need commercial claims for Dr. Mazaheri?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mazaheri and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ata Mazaheri treated 121 Medicare patients in 2024, average age 76
CMS counts 121 Medicare patients who saw Dr. Mazaheri in 2024. The largest group is 75 to 84, with 47 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 40% are also on Medicaid. Their average risk score is 2.15, 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. Mazaheri's median patient age at 60, with 49% women.
Dr. Mazaheri's Medicare patients by age, 2024
Dr. Mazaheri's Medicare patients by sex, 2024
- Women6150%
- Men6050%
Chronic conditions among Dr. Mazaheri's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Diabetes48%
- Chronic kidney disease47%
- Ischemic heart disease41%
- Mood disorders38%
- Depression35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mazaheri's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Ata Mazaheri takes part in Medicare
Dr. Mazaheri accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Ata Mazaheri received $9,879 in industry payments from 2016 to 2025
CMS Open Payments shows 23 general payments to Dr. Mazaheri from 4 drug and device companies from 2016 to 2025. Education make up the largest share, 56% of the total. Intuitive Surgical, Inc. paid the most, $7,022.
General payments to Dr. Mazaheri by program year, 2016 to 2025
General payments to Dr. Mazaheri by kind, 2016 to 2025
- Education$5,50056%
- Travel and lodging$2,74328%
- Food and beverage$1,63617%
Companies that paid Dr. Mazaheri the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ata Mazaheri has 1 award and honors on record
Dmand AI lists 1 award for Dr. Mazaheri.
Awards and honors for Dr. Mazaheri
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Ata Mazaheri graduated from Royal College of Surgeons Ireland
Dr. Mazaheri graduated from Royal College of Surgeons Ireland in 2000. Dr. Mazaheri is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Ata Mazaheri accepts plans from 7 insurance carriers
Dr. Mazaheri is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
Plan types Dr. Mazaheri accepts, by number of carriers
- Medicare7
- PPO5
- HMO3
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Ata Mazaheri'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| 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. Ata Mazaheri
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. Ata Mazaheri's NPI number?
Dr. Ata Mazaheri's NPI number is 1164467239. It was assigned on June 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Ata Mazaheri?
Dr. Ata Mazaheri is a general surgeon in Torrance, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Ata Mazaheri practice?
Dr. Mazaheri practices at 4101 Torrance Blvd, Torrance, CA 90503. Dr. Mazaheri's primary practice is Providence Little Company of Mary Medical Center Torrance in Torrance, California, part of Providence Health & Services. Dmand AI also links Dr. Mazaheri to 1 physician office.
What is Dr. Ata Mazaheri's office phone number?
The practice phone on file for Dr. Mazaheri is (310) 540-7676.
What is Dr. Ata Mazaheri's medical license number?
Dr. Mazaheri holds California license A79930, one of the licenses on file in 2 states.
Which states has Dr. Ata Mazaheri been licensed in?
Dmand AI has state licenses on file for Dr. Mazaheri in California (2002 to 2026) and Illinois (2002 to 2005).
Which hospitals is Dr. Ata Mazaheri affiliated with?
Dr. Mazaheri practices at Providence Little Company of Mary Medical Center Torrance in Torrance, California. Dr. Mazaheri is also affiliated with Torrance Memorial Medical Center.
Does Dr. Ata Mazaheri accept Medicare?
Yes. CMS data shows Dr. Mazaheri billed Medicare for 407 services in 2024, and Dr. Mazaheri accepts Medicare assignment.
How many Medicare patients does Dr. Ata Mazaheri see?
CMS counts 121 Medicare patients who saw Dr. Mazaheri in 2024, with an average age of 76.
Is Dr. Ata Mazaheri board certified?
Yes. Dr. Mazaheri is board certified in surgery by the American Board of Surgery.
Show 5 more questionsShow fewer questions
What services does Dr. Ata Mazaheri bill to Medicare?
In 2024, Dr. Mazaheri's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99223) and emergency department visit (99285).
Where did Dr. Ata Mazaheri go to medical school?
Dr. Mazaheri graduated from Royal College of Surgeons Ireland in 2000.
Has Dr. Ata Mazaheri received payments from drug or device companies?
CMS Open Payments shows $9,879 in general payments to Dr. Mazaheri from 4 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Ata Mazaheri been practicing?
Dr. Mazaheri graduated from medical school in 2000, 26 years ago.
What insurance does Dr. Ata Mazaheri accept?
Dr. Mazaheri is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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