Doctor profile · Federal record

Dr. Mark Williams, MD

Anesthesiology Physician (CMS: Anesthesiology) · Phoenix, AZ

  • NPI 1679505440
  • Accepts Medicare
  • 40 yrs in practice
  • Male
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
250 E Dunlap Ave
Phoenix, AZ 85020
(602) 273-9333
fax (480) 609-9350
Mailing address
Po Box 13385
Scottsdale, AZ 852673385

Credentials & registration

NPPES · NUCC
NPI registered
July 2006 — 20 yrs on file
Profile last updated
May 16, 2008
Year of graduation
1986 — 40 yrs since
Specialty taxonomy
207L00000X — NUCC code
State license (1)
Arizona #22063

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1679505440. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
48
Distinct HCPCS
2
Medicare allowed
$21,158
HCPCS Description Services Patients Avg allowed
36620 Insertion of artery tube for blood sampling or infusion through skin 25 24 $43
00670 Anesthesia for extensive surgery on spine 23 22 $873

In context: peer comparison

Among 166 peers in Phoenix Anesthesiology Physician, average services per provider: 34. This provider delivers 1.4× the peer median.

Frequently asked questions

Auto-generated from federal data
What is Dr. Mark Williams's medical specialty?
Dr. Mark Williams practices Anesthesiology Physician in Phoenix, AZ.
Where does Dr. Mark Williams practice?
Dr. Mark Williams practices at 250 E Dunlap Ave, Phoenix, AZ 85020. Office phone: 6022739333.
What is Dr. Mark Williams's NPI?
Dr. Mark Williams's National Provider Identifier (NPI) is 1679505440, issued by NPPES.
Does Dr. Mark Williams accept Medicare assignment?
Yes. Dr. Mark Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Williams commonly perform?
Top Medicare-reported procedures in 2023: Insertion of artery tube for blood sampling or infusion through skin (HCPCS 36620); Anesthesia for extensive surgery on spine (HCPCS 00670). Source: CMS Medicare Physician & Other Practitioners file.