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WILLIAM ALLEN CASS M.D.
NPI 1710041207
Anesthesiology in Columbia, MO

Active since December 20, 2006PECOS EnrolledAccepts Medicare Assignment
1600 E BROADWAY, COLUMBIA, MO 65201(573) 815-8000 Get Directions Write a Review

NPPES record last updated: July 21, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About William Allen Cass M.d. NPPES

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

WILLIAM ALLEN CASS M.D. (NPI 1710041207) is an individual anesthesiology provider in Columbia, Missouri, licensed in Missouri (2005025929) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with Boone Hospital Center, and maintains a secondary practice location in Columbia.

NPPES Registry Identity

NPI1710041207
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameWILLIAM ALLEN CASSCredential: M.D.
Location Address1600 E BROADWAYColumbia, MO 65201-5844
Mailing AddressPo Box 843966Kansas City, MO 64184-3966 · (573) 884-3300 · Fax (573) 884-0943
Phone(573) 815-8000
Sole ProprietorNo
Medical School CMSOtherGraduated 1989
Enumeration DateDecember 20, 2006
Last NPPES UpdateJuly 21, 2026
NPPES CertifiedJuly 21, 2026
✔ NPI 1710041207 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in MO · 2005025929
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.
1600 E BROADWAY, Columbia, MO 65201
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Secondary Practice Location 1

Location 11 Hospital DrColumbia, MO 65201-5276 · Phone (573) 882-2568 · Fax (855) 903-0985

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Kansas City, Oscar Health, Oscar Health Maintenance Organization of Florida and more.Insurance ›

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

William Allen Cass 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 ID6103861869
PECOS Enrollment IDI20051130000908
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 Reassignments

4

Medicare enrollment records show William Cass reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Curators Of The University Of Missouri
1.0 mi
Multi-Specialty
1 HOSPITAL DR
Columbia, MO 65212
  • Reassigned Medicare billing, Missouri enrollment
  • 1,395 clinicians in this Medicare group
NPI 1235126921 (573) 882-4141
Mid-America Anesthesia Consultants, PC
1.3 mi
Anesthesiology
1316 OLD 63 S, SUITE 102
Columbia, MO 65201
  • Reassigned Medicare billing, Missouri enrollment
  • 63 clinicians in this Medicare group
NPI 1083728463 (573) 875-8838
Columbia Orthopaedic Group, LLP
1.4 mi
Orthopaedic Surgery
1 S KEENE ST
Columbia, MO 65201
  • Reassigned Medicare billing, Missouri enrollment
  • 110 clinicians in this Medicare group
NPI 1851392542 (573) 443-2402
Orthomed Staffing LLC
484 mi
Anesthesiology
15305 DALLAS PKWY STE 900
Addison, TX 75001
  • Reassigned Medicare billing, Missouri enrollment
  • 175 clinicians in this Medicare group
NPI 1225514276 (469) 863-9978

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 4

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.

Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) 64415
This procedure involves injecting a numbing agent or steroid into your arm's nerve bundle. It's done to manage pain or inflammation. The injection helps block nerve signals that cause discomfort, providing relief. It's a safe, common procedure.
28 services28 patients
Ultrasonic guidance for needle placement 76942
Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.
20 services20 patients
Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) 64447
This procedure involves injecting a numbing agent and/or steroid into a nerve in your thigh. It's done to alleviate pain or inflammation. A needle will be carefully positioned near the nerve, and the medicine will be administered.
18 services18 patients
Injection of anesthetic agent and/or steroid into other nerve or branch 64450
This procedure involves injecting an anesthetic agent or steroid into a specific nerve or its branch. The goal is to relieve pain by reducing inflammation and numbing the area. It is commonly used for chronic pain management. The process is safe and usually quick.
18 services18 patients

Hospital Affiliations CMS Care Compare 2

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

Boone Hospital Center

Acute Care Hospitals · Columbia, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260068
Location1600 E BroadwayColumbia, MO 65201 · Boone County
Emergency services Birthing friendly

University Of Missouri Health Care

Acute Care Hospitals · Columbia, MO
2/5 CMS rating
OwnershipGovernment - State
CMS Certification Number260141
LocationOne Hospital DriveColumbia, MO 65212 · Boone 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.

DIANA L ERION FNP-BC
Nurse Practitioner (Family)
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 875-8838
THOMAS WESLEY MEYER DO
Anesthesiology
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-6262
EMILY MOORE CRT
Respiratory Therapist, Certified
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-8000
EMMA L MALLORY NP-C
Nurse Practitioner
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-2700
WILLIAM LOGAN BRADLEY MS, RDN, LD
Dietitian, Registered
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-3189
MICHAEL HAUAN MD
Emergency Medicine
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-3573
REBEKAH BAIL
Nurse Practitioner (Family)
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-8000
SARAH RACHAEL KIRCHOFF
Nurse Practitioner (Family)
1600 E BROADWAY
COLUMBIA, MO 65201
Boone County (573) 815-3501

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 Cass's NPI number?

The NPI number for William Cass is 1710041207. It was assigned to this individual provider in the NPPES registry on December 20, 2006.

Where is William Cass located?

William Cass practices at 1600 E Broadway, Columbia, MO 65201. The listed phone number is (573) 815-8000.

What is William Cass's specialty?

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

Is William Cass enrolled in Medicare?

Yes. William Cass 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 organizations bill Medicare for William Cass's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Cass reassigns Medicare benefits to 4 organizations: The Curators Of The University Of Missouri (Columbia, MO), Mid-America Anesthesia Consultants, PC (Columbia, MO), Columbia Orthopaedic Group, LLP (Columbia, MO) and Orthomed Staffing LLC (Addison, TX). Each 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 Cass's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Cass accept?

Health plans from Blue Cross and Blue Shield of Kansas City, Oscar Health, Oscar Health Maintenance Organization of Florida and Oscar Insurance Company list William Cass as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Cass affiliated with any hospitals?

According to CMS data, William Cass is affiliated with Boone Hospital Center and University Of Missouri Health Care.

When was this NPI record last updated?

The NPPES record for William Cass was last updated on July 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.