DR. WILLIAM B. AHNN M.D.
NPI 1457338683
Anesthesiology in San Bernardino, CA

Q: What is William Ahnn's NPI number?

The NPI number for William Ahnn is 1457338683. It was assigned to this individual provider in the NPPES registry on December 29, 2005.

Q: What is William Ahnn's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Q: When was this NPI record last updated?

The NPPES record for William Ahnn was last updated on November 10, 2015. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since December 29, 2005PECOS EnrolledAccepts Medicare Assignment

95/100

CMS Quality Rating

2101 N WATERMAN AVE, SAN BERNARDINO, CA 92404(909) 883-3711 Get Directions Write a Review

NPPES record last updated: November 10, 2015. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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About Dr. William B. Ahnn M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM B. AHNN M.D. (NPI 1457338683) is an individual anesthesiology provider in San Bernardino, California, licensed in California (A31405) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS and is a graduate of Other (1969).

NPPES Registry Identity

NPI1457338683

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameDR. WILLIAM B. AHNNCredential: M.D.

Location Address2101 N WATERMAN AVESan Bernardino, CA 92404-4836

Mailing Address210 N Tustin AveSanta Ana, CA 92705-3807 · (800) 883-7243 · Fax (714) 647-1245

Phone(909) 883-3711

Sole ProprietorNo

Medical School CMSOtherGraduated 1969

Enumeration DateDecember 29, 2005

Last NPPES UpdateNovember 10, 2015

✔ NPI 1457338683 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in CA · A31405

Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

Also ListedAnesthesiology · Pain MedicineTaxonomy 207LP2900X · License A31405 (CA)

2101 N WATERMAN AVE, San Bernardino, CA 92404

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Other Identifiers 4

Medicare PINP00620296CA

Medicaid00A314051CA

Medicare UPINA26466CA

Medicare PIN00A314052CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William B. Ahnn M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID648239855

PECOS Enrollment IDI20041004001190

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

95/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

88.9

Improvement Activities

Cost

70.34

Reported Quality Measures

Post-Anesthetic Transfer of Care Measure: Procedure Room to a Post Anesthesia Care Unit (PACU)

Percentage of patients, regardless of age, who are under the care of an anesthesia practitioner and are admitted to a PACU or other non-ICU location in which a post-anesthetic formal transfer of care protocol or checklist which includes the key transfer of…

31%29 patients2/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NICHOLAS WALTHER PA-C

Physician Assistant (Medical)