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WILLIAM CLARENCE SANTOS M.D.
NPI 1811981509
Anesthesiology in Iowa City, IA

Active since September 08, 2005PECOS Enrolled
200 HAWKINS DR, DEPT OF ANESTHESIA, IOWA CITY, IA 52242(319) 356-2633(319) 356-2940 Get Directions Write a Review

NPPES record last updated: October 16, 2013. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About William Clarence Santos M.d. NPPES

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

WILLIAM CLARENCE SANTOS M.D. (NPI 1811981509) is an individual anesthesiology provider in Iowa City, Iowa, licensed in Iowa (41289) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1811981509
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameWILLIAM CLARENCE SANTOSCredential: M.D.
Location Address200 HAWKINS DR, DEPT OF ANESTHESIAIowa City, IA 52242-1009
Mailing Address200 Hawkins Dr, Dept Of AnesthesiaIowa City, IA 52242-1009 · (319) 356-2633 · Fax (319) 356-2940
Phone(319) 356-2633
Fax(319) 356-2940
Sole ProprietorNo
Enumeration DateSeptember 8, 2005
Last NPPES UpdateOctober 16, 2013
✔ NPI 1811981509 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
Licenses✔ Licensed in IA · 41289✔ Licensed in TX · L6618✔ Licensed in CA · G76518
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.
200 HAWKINS DR, Iowa City, IA 52242
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Other Identifiers 3

Medicare UPING08113CA
Medicare PIN00G765180
Medicare PINTXB131525TX

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Clarence Santos M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Billing Reassignment

Medicare enrollment records show William Santos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Central Anesthesia Service Exchange Medical Group, Inc.
1,586 mi
Anesthesiology
3315 WATT AVE.
Sacramento, CA 95821
  • Reassigned Medicare billing, California enrollment
  • 167 clinicians in this Medicare group
NPI 1194826404 (916) 481-0777

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Anesthesia for lens surgery 00142
Anesthesia for lens surgery involves administering medication to numb the eye area, ensuring you feel no pain during the procedure. This can be a local anesthetic (numbing only the eye area) or general (where you're asleep). It helps make the surgery comfortable and stress-free.
254 services203 patients
Anesthesia for exam of colon using an endoscope 00812
Anesthesia for a colon examination with an endoscope is a method used to ensure comfort during the procedure. It involves administering medication to help you relax or sleep, thus reducing discomfort as the endoscope, a thin, flexible tube, is navigated through your colon.
11 services11 patients

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.

SANGIL LEE M.D.
Emergency Medicine
200 HAWKINS DR
IOWA CITY, IA 52242
Johnson County (319) 356-2233
RAMI G. EL ABIAD M.D.
Internal Medicine (Gastroenterology)
200 HAWKINS DR
IOWA CITY, IA 52242
Johnson County (319) 356-4901
GRERK SUTAMTEWAGUL MD
Internal Medicine (Hematology & Oncology)
200 HAWKINS DR, DEPT OF INTERNAL MEDICINE
IOWA CITY, IA 52242
Johnson County (319) 356-1616
DR. KALEB TANNER VEIT D.O.
Internal Medicine (Critical Care Medicine)
200 HAWKINS DR
IOWA CITY, IA 52242
Johnson County (319) 356-2320
OMAR JABER M.D
Chronic Disease Hospital
200 HAWKINS DR
IOWA CITY, IA 52242
Johnson County (319) 471-8958
JENNIFER MANCUSO MS, CGC
Genetic Counselor, MS
200 HAWKINS DR, 31663 PFP
IOWA CITY, IA 52242
Johnson County (319) 384-7983
ASHLEY KAISER M.D.
Obstetrics & Gynecology
200 HAWKINS DR, DEPT OF OBGYN
IOWA CITY, IA 52242
Johnson County (319) 356-2294
MRS. NANCY JANE MILLICE
Health Educator
200 HAWKINS DR, 0733 JPP
IOWA CITY, IA 52242
Johnson County (319) 356-3825

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Santos's NPI number?

The NPI number for William Santos is 1811981509. It was assigned to this individual provider in the NPPES registry on September 8, 2005.

Where is William Santos located?

William Santos practices at 200 Hawkins Dr Dept Of Anesthesia, Iowa City, IA 52242. The listed phone number is (319) 356-2633.

What is William Santos's specialty?

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

Is William Santos enrolled in Medicare?

Yes. William Santos is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Santos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Santos reassigns Medicare benefits to Central Anesthesia Service Exchange Medical Group, Inc. (Sacramento, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Santos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Santos was last updated on October 16, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.