Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. William B. Ahnn, MD

Individual provider Anesthesiology Physician · NPI 1457338683

Dr. William B. Ahnn, MD practises Anesthesiology in San Bernardino, California. Qualified in 1969, 57 years ago. Practices with Palm Springs Anesthesia Services PC, a 89-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
57
Licensed in
CA
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2101 N Waterman Ave
San Bernardino, CA 92404-4836 Not confirmed with CMS for 11 years — call before visiting
Phone: (909) 883-3711
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence A31405 (CA)
Pain Medicine (Anesthesiology) Physician Taxonomy 207LP2900X · Licence A31405 (CA)

Record details

NPI number1457338683
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 29, 2005
Last updated in NPPESNovember 10, 2015

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Also practisesINTERVENTIONAL PAIN MANAGEMENT
Medical schoolOTHER
Graduated 1969 (57 years in practice)
Group practice Palm Springs Anesthesia Services Pc — 89 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients47
Services billed 54 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • St Bernardine Medical Center Hospital · San Bernardino, CA

Colleagues at Palm Springs Anesthesia Services PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 89 clinicians in the practice; 12 are shown here.

Other providers in San Bernardino