Sam S Ahn, MD

1 location · North Bay Allergy and Asthma · 3 clinicians in this group

Hospitals listed: John Muir Medical Center - Walnut Creek Campus · Providence Queen of the Valley Medical Center · Sonoma Valley Hospital. That is not proof they admit you there this week.

3 plans · 1 carrier

Licence C147289 · Current

Licensed to practise in California · since 2017 · expires 2027-02-28 · Harvard Medical School.

Matched on the licence number without its letter prefix; check the name before relying on it.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

• American Board of Allergy and Immunology - Allergy and Immunology
• American Board of Internal Medicine - Internal Medicine

3 hospitals

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

• John Muir Medical Center - Walnut Creek CampusWalnut Creek, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of John Muir Health, which runs 3 hospitalsPatients rate it 3 of 5 · 77% would definitely recommend it
  Overall rating: 2 of 5 starsWorse than the national rate — Abdominopelvic accidental puncture or laceration rate: 2.01 (1.17 to 2.85) · 2,206 cases, Jul 2022 – Jun 2024Worse than the national rate — Death rate among surgical inpatients with serious treatable complications: 222.42 (177.82 to 267.02) · 120 cases, Jul 2022 – Jun 2024Worse than the national rate — Pressure ulcer rate: 1.4 (0.91 to 1.9) · 9,764 cases, Jul 2022 – Jun 2024Worse than the national rate — SSI - Colon Surgery: 2.734, Oct 2024 – Sep 2025Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.536, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.341, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.455, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.245, Oct 2024 – Sep 2025
• Providence Queen of the Valley Medical CenterNapa, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Providence, which runs 54 hospitals in 7 statesPatients rate it 3 of 5 · 74% would definitely recommend it
  Overall rating: 4 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.107, Oct 2024 – Sep 2025
• Sonoma Valley HospitalSonoma, CAAcute Care Hospital · Government - Hospital District or Authority · Has an emergency departmentPatients rate it 4 of 5 · 79% would definitely recommend it
  Overall rating: 2 of 5 starsNo measure marked better or worse than the national rate

$717,627

Medicare paid this office $717,627 for 544 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Procedures year by year

Times billed to Original Medicare each year. A blank year means fewer than 11 people had it, or none: Medicare does not publish smaller counts. Medicare Advantage patients are not included.

Who their Medicare patients are

544 Original Medicare patients in 2024. Average age 73 · Under 65 9% · 85 and older 7% · Women 68% · Also on Medicaid 14% · Health risk score 0.93. At or below the middle of the specialty; the typical allergy/ immunology clinician is at 1.

Conditions among them: High blood pressure 63% · Diabetes 19% · Coronary heart disease 17% · Cancer 16% · Depression 15% · Chronic kidney disease 13% · Atrial fibrillation 13% · COPD 11% · Heart failure 9% · Stroke 5% · Dementia 2%.

The office billed $1,651,621, Medicare allowed $920,579 and paid $717,627; for 37,771 services of 35 kinds; $560,774 of it was for drugs given in the office and $156,853 for care.

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

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.

$41,590 in 2024

Medicaid paid $41,590 for 1,746 billed services this clinician did in 2024, up to 57 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.

$1,225,168

Pharmacies billed $1,225,168 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

1,320 generic and fewer than 11 brand-name prescriptions · $1,225,168 in drug cost · 31 antibiotic prescriptions to 25 people.

Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.

Year by year

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

$4,313 in 2025

Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.

A payment is not proof that care is biased.