Margaret V Cooper Vaughn, MD
Obstetrics/Gynecology · Hollister
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 14
- 2 carriers
- Offices
- 2
Offices
2 locations · Hazel Hawkins Memorial Hospital · County of Santa Clara
Plans that list them
14 plans · 2 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Vaughn’s office at (408) 885-5000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
14 of 14 plans
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Silicon (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health smartHMO (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health the ONE (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Anthem Full Dual Advantage Aligned (HMO D-SNP) | Anthem Blue Cross | Listed | Oct 3, 2026 |
| Anthem Medicare Advantage (HMO-POS) | Anthem Blue Cross | Listed | Oct 3, 2026 |
California Medical Board record
Licence A87941 · Current
Licensed to practise in California · since 2004 · expires 2028-07-31 · Rush Medical College of Rush University.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Original Medicare doctor bills
$3,752
Medicare paid this office $3,752 for 15 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Who their Medicare patients are
15 Original Medicare patients in 2024. Average age 74 · Women 100% · Health risk score 0.80. At or below the middle of the specialty; the typical obstetrics & gynecology clinician is at 0.88.
The office billed $7,895, Medicare allowed $4,938 and paid $3,752; for 49 services of 12 kinds.
Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.
Year by year
| 2024 | 15 | 49 | 74 | 0.80 | $7,895 | $3,752 |
| 2023 | 15 | 28 | 68 | 0.98 | $5,775 | $3,086 |
| 2014 | 15 | 39 | 67 | 0.68 | $7,216 | $3,003 |
| 2013 | 36 | 84 | 61 | 1.15 | $22,872 | $7,752 |
Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.
See the services billed each year
2013: 2 services
| Short return visit | 16 | $915 | $40 |
| Short return visit (20+ min) | 12 | $842 | $65 |
Medicaid work
$13,746 in 2024
Medicaid paid $13,746 for 90 billed services this clinician did in 2024, up to 19 people in a month for one service.
Medicaid and CHIP claims where this clinician did the service, fee-for-service and managed care together. Any month with fewer than 11 patients is hidden, so small Medicaid practices undercount.
| Clinic visit/encounter, all-inclusive | 90 | $13,746 |
| 2024 | 90 | 1 | 19 | $13,746 |
| 2023 | 382 | 3 | 37 | $28,207 |
| 2019 | 72 | 1 | 26 | $7,941 |
| 2018 | 237 | 1 | 42 | $19,925 |
See the largest Medicaid services in earlier years
2023
| Clinic visit/encounter, all-inclusive | 171 | $28,207 |
| Urinalysis, by dip stick or tablet reagent for bilirubin, glucose, hemoglobin, ketones, leukocytes, nitrite, pH, protein, specific gravity, urobilinogen, any number of these constituents; non-automated, without microscopy | 129 | $0 |
| Service | 82 | $0 |
2019
| EMERGENCY DEPT VISIT MOD MDM | 72 | $7,941 |
2018
| EMERGENCY DEPT VISIT MOD MDM | 237 | $19,925 |
Money from drug and device companies
$49 in 2025
| 2025 | 2 | 2 | None | $49 |
| 2024 | 3 | 3 | None | $73 |
| 2023 | 4 | 5 | None | $107 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
See all 2 published payments
| Dexcom | Meals · 2025-05-12 | Dexcom G6 Transmitter | $30 |
| Biogen | Meals · 2025-02-26 | Zurzuvae | $19 |
See earlier years (2024, 2023)
2024: $73
| Lilly USA | Kisunla | $27 | 1 payment
|
| Merck Sharp & Dohme | Pifeltro | $24 | 1 payment
|
| Biogen | None | $23 | 1 payment
|
2023: $107
| Merck Sharp & Dohme | Pifeltro | $48 | 2 payments
|
| Sumitomo Pharma America | Myfembree | $21 | 1 payment
|
| Averitas Pharma | Qutenza | $21 | 1 payment
|
| Organon | Nexplanon | $18 | 1 payment
|
Professional record
- NPI
- 1982607990
- Licence
- CA A87941California A87941: Current · expires 2028-07-31
- Trained
- Rush Medical College of Rush University, 1998
- Group
- Hazel Hawkins Memorial Hospital · County of Santa Clara
- Gender
- Female
More record details
- Sole proprietor
- Yes
- Taxonomy
- Federal specialty code 174400000X (174400000X)
- Mailing address
- Po Box 215, Fairfield, CA, 94533
- NPI first listed
- 2005-05-23
- NPI last updated
- 2015-08-04
This is when the NPI record was last certified, not a medical board exam.