Dr. Siobhan L. Calhoun, MD
- Medicare services, 2024
- 58
- Medicare patients, 2024
- 62
- Part D claims, 2024
- 115
- MIPS score, 2024
- 88
- Hospital affiliations
- 1
- Practice address
- 2299 Mowry Ave, Fremont, CA 94538
- Practice phone
- Call (415) 791-3438
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Washington Outpatient Surgery Center
Surgery Center - Medicare-Certified · Fremont, California
Find Dr. Calhoun'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. Siobhan L. Calhoun is an OB-GYN in Fremont, California
Dr. Calhoun practices at Washington Outpatient Surgery Center in Fremont, California.
Dr. Calhoun's NPI, 1396726295, was assigned on November 8, 2005. Dr. Calhoun graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1995. Dr. Calhoun holds California license A62859.
- NPI
- 1396726295NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688735038
- NPI enumeration date
- November 8, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 791-3438
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Siobhan L. Calhoun practices at Washington Outpatient Surgery Center in Fremont, California
Dr. Calhoun's primary practice is Washington Outpatient Surgery Center, at 2299 Mowry Ave, Fremont, CA 94538. The practice phone is (415) 791-3438.
- Washington Outpatient Surgery Center2299 Mowry Ave, Fremont, CA 94538Phone(415) 791-3438
Source: Dmand AI Affiliation Data
Dr. Siobhan L. Calhoun is affiliated with 3 sites of care and 1 medical group
Dr. Calhoun's primary practice is Washington Outpatient Surgery Center in Fremont, California. Dr. Calhoun is also affiliated with Washington Health. The medical group on file is Washington Health Medical Group. Dmand AI also links Dr. Calhoun to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Siobhan L. Calhoun's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Calhoun practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Washington Outpatient Surgery Center | 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. Siobhan L. Calhoun is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Calhoun's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Calhoun is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dr. Calhoun is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
Clinical focus
Dmand AI lists menopause, pelvic prolapse and vaginal infection among the conditions Dr. Calhoun treats.
OB-GYNs near Dr. Calhoun
Counts of OB-GYNs 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. Siobhan L. Calhoun billed Medicare for 58 services in 2024
CMS data shows 58 Medicare services from Dr. Calhoun across 2 procedure codes in 2024, for 62 Medicare patients. Medicare paid $3,532 for them. Every service was in an office.
Dr. Calhoun's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 332024: 316%
- Office and hospital visits
- 2023: 352024: 2723%
Dr. Calhoun compared with the California median for OB-GYNs, 2024
- Dr. Calhoun
- California median
- Medicare services
- 58vs 58Close to median
- Medicare patients
- 62vs 5219% above
- Part D claims
- 44vs 3526% above
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Calhoun'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. Calhoun and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Siobhan L. Calhoun treated 62 Medicare patients in 2024, average age 72
CMS counts 62 Medicare patients who saw Dr. Calhoun in 2024. The largest group is 65 to 74, with 38 patients. 75% of them have high cholesterol, and 74% have high blood pressure. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Calhoun's median patient age at 44, with 97% women.
Dr. Calhoun's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Calhoun's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis47%
- Diabetes35%
- Chronic kidney disease27%
- Osteoporosis26%
- Ischemic heart disease21%
- Anxiety19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Calhoun's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women97%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Siobhan L. Calhoun wrote 115 Medicare Part D claims in 2024
In 2024, Dr. Calhoun wrote 115 Medicare Part D claims for 45 patients. 78% of them were for generic drugs. CMS names the drug for 44 of them, across 2 drugs with 11 or more claims each, at $1,618 in total drug cost. In 2023, CMS named 31 claims across 2 drugs.
Dr. Calhoun's Part D claims by kind of drug, 2024
- Generic90 claims78%
- Brand-name25 claims22%
Dr. Calhoun'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: 312024: 4442%
Drugs named by CMS: 2 in 2024, 2 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
Dr. Siobhan L. Calhoun scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Calhoun for performance year 2024, reported as part of a group. Dr. Calhoun accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Calhoun's MIPS scores, performance year 2024
- 88of 100Final score
- 66.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Siobhan L. Calhoun received $121 in industry payments from 2016 to 2025
CMS Open Payments shows 5 general payments to Dr. Calhoun from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $27.
General payments to Dr. Calhoun by program year, 2016 to 2025
Companies that paid Dr. Calhoun 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. Siobhan L. Calhoun has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Calhoun, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Calhoun
- 2013
- CMS Stage 1 EHR
- Undated
- ACOG Fellow
Source: Dmand AI Professional Profile Data
Dr. Siobhan L. Calhoun graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School
Dr. Calhoun graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1995. Dr. Calhoun is a member of American College of Obstetricians and Gynecologists.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Siobhan L. Calhoun accepts plans from 9 insurance carriers
Dr. Calhoun is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Humana
- Regence Health Plans
- CMS Medicare
- +1 more carriersWith a free account
Plan types Dr. Calhoun accepts, by number of carriers
- Medicare9
- PPO7
- HMO3
- POS3
- EPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Siobhan L. Calhoun'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)Clinician Public Reporting: Overall MIPS Performance (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. Siobhan L. Calhoun
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. Siobhan L. Calhoun's NPI number?
Dr. Siobhan L. Calhoun's NPI number is 1396726295. It was assigned on November 8, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Siobhan L. Calhoun?
Dr. Siobhan L. Calhoun is an OB-GYN in Fremont, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Siobhan L. Calhoun practice?
Dr. Calhoun practices at 2299 Mowry Ave, Fremont, CA 94538. Dr. Calhoun's primary practice is Washington Outpatient Surgery Center in Fremont, California. Dmand AI also links Dr. Calhoun to 1 group practice or clinic.
What is Dr. Siobhan L. Calhoun's office phone number?
The practice phone on file for Dr. Calhoun is (415) 791-3438.
What is Dr. Siobhan L. Calhoun's medical license number?
Dr. Calhoun holds California license A62859.
Which hospitals is Dr. Siobhan L. Calhoun affiliated with?
Dr. Calhoun is affiliated with Washington Health.
What medical group is Dr. Siobhan L. Calhoun part of?
Dr. Calhoun is linked to Washington Health Medical Group.
Does Dr. Siobhan L. Calhoun accept Medicare?
Yes. CMS data shows Dr. Calhoun billed Medicare for 58 services in 2024, and Dr. Calhoun accepts Medicare assignment.
What is Dr. Siobhan L. Calhoun's MIPS score?
Dr. Calhoun's MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
How many Medicare patients does Dr. Siobhan L. Calhoun see?
CMS counts 62 Medicare patients who saw Dr. Calhoun in 2024, with an average age of 72.
Show 7 more questionsShow fewer questions
Is Dr. Siobhan L. Calhoun board certified?
Yes. Dr. Calhoun is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
What services does Dr. Siobhan L. Calhoun bill to Medicare?
In 2024, Dr. Calhoun's most billed Medicare services were medicare service (G0101) and office visit, established patient (99213).
Where did Dr. Siobhan L. Calhoun go to medical school?
Dr. Calhoun graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1995.
What drugs does Dr. Siobhan L. Calhoun prescribe most?
In 2024 Medicare Part D data, Dr. Calhoun's most prescribed drugs by claims were Estradiol and Fluconazole.
Has Dr. Siobhan L. Calhoun received payments from drug or device companies?
CMS Open Payments shows $121 in general payments to Dr. Calhoun from 5 companies from 2016 to 2025. The largest total came from Pfizer Inc.
How long has Dr. Siobhan L. Calhoun been practicing?
Dr. Calhoun graduated from medical school in 1995, 31 years ago.
What insurance does Dr. Siobhan L. Calhoun accept?
Dr. Calhoun is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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