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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ERIC ALDRICH WILLIAMS DO
NPI 1194301705
Anesthesiology in Des Moines, IA

Active since March 23, 2021PECOS EnrolledAccepts Medicare Assignment
1200 PLEASANT ST, DES MOINES, IA 50309(515) 401-1950(515) 401-1955 Get Directions Write a Review

NPPES record last updated: September 22, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 22, 2026, Jan 2, 2026, Jun 20, 2025 and 2 more (5 updates tracked since 2021).

About Eric Aldrich Williams Do NPPES

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

ERIC ALDRICH WILLIAMS DO (NPI 1194301705) is an individual anesthesiology provider in Des Moines, Iowa, licensed in Iowa (DO-06913) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, is affiliated with Unitypoint Health - Des Moines Iowa Methodist Medi, and is a graduate of Des Moines University Of Osteopathic Medicine And Health Sciences (2021).

NPPES Registry Identity

NPI1194301705
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameERIC ALDRICH WILLIAMSCredential: DO
Location Address1200 PLEASANT STDes Moines, IA 50309-1406
Mailing Address4201 Westown Pkwy Ste 236West Des Moines, IA 50266-6720 · (515) 401-1950 · Fax (515) 401-1955
Phone(515) 401-1950
Fax(515) 401-1955
Sole ProprietorNo
Medical School CMSDes Moines University Of Osteopathic Medicine And Health SciencesGraduated 2021
Enumeration DateMarch 23, 2021
Last NPPES UpdateSeptember 22, 20265 updates tracked since enumeration
NPPES CertifiedSeptember 22, 2026
✔ NPI 1194301705 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in IA · DO-06913
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 ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1200 PLEASANT ST, Des Moines, IA 50309
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Eric Aldrich Williams Do 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 ID9133520620
PECOS Enrollment IDI20250611000641
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 Eric Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Associated Anesthesiologists, P.C.
Same address
Anesthesiology
1200 PLEASANT ST
Des Moines, IA 50309
  • Reassigned Medicare billing, Iowa enrollment
  • Medicare enrollment name: Associated Anesthesiologists PC
  • 66 clinicians in this Medicare group
NPI 1215904750 (515) 401-1950

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

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Unitypoint Health - Des Moines Iowa Methodist Medi

Acute Care Hospitals · Des Moines, IA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number160082
Location1200 Pleasant StreetDes Moines, IA 50309 · Polk County
Emergency services Birthing friendly

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.

CENTRAL IOWA HOSPITAL CORPORATION
Pharmacy
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-5936
CATHERINE P MCNEILL M.D.
Pediatrics
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-6611
CENTRAL IOWA HOSPITAL CORPORATION
Rehabilitation Unit
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-6212
DR. LISA I HARDISTY M.D.
Pediatrics
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-5926
BROOKE JOHNSON D.O.
Emergency Medicine
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-6262
JAMIE LYNN PIOTROWSKI NP-C
Nurse Practitioner
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 524-1621
BILAL HASAN BAIG DO
Internal Medicine
1200 PLEASANT ST
DES MOINES, IA 50309
Polk County (515) 241-6636
HOLLEY A BZDEGA MD
Pediatrics (Neonatal-Perinatal Medicine)
1200 PLEASANT ST, NEONATOLOGY
DES MOINES, IA 50309
Polk County (515) 241-4444

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 Eric Williams's NPI number?

The NPI number for Eric Williams is 1194301705. It was assigned to this individual provider in the NPPES registry on March 23, 2021.

Where is Eric Williams located?

Eric Williams practices at 1200 Pleasant St, Des Moines, IA 50309. The listed phone number is (515) 401-1950.

What is Eric Williams's specialty?

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

Is Eric Williams enrolled in Medicare?

Yes. Eric Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Eric Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Eric Williams reassigns Medicare benefits to Associated Anesthesiologists, P.C. (Des Moines, IA). 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 Eric Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Eric Williams affiliated with any hospitals?

According to CMS data, Eric Williams is affiliated with Unitypoint Health - Des Moines Iowa Methodist Medi.

When was this NPI record last updated?

The NPPES record for Eric Williams was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 days 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.