Dr. William Dunn Mitchell, MD

Dr. William Dunn Mitchell is a Pediatrics Physician provider (Pediatrics) practicing in Aspen, CO, registered in the NPPES registry with NPI 1134202575 since 2006. The credential MD stands for Doctor of Medicine. Practices at Daniel R. George (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum

NPI	1134202575
Entity type	Individual (Type 1)
Name	Dr. William Dunn Mitchell
Credential	MD
Sex	Male
Practice address	630 E HYMAN AVE, SUITE # 25, Aspen, CO, 81611
Phone	9705441300
Fax	9705441334
Enumeration date	2006-10-21
Last updated in NPPES	2014-01-24

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
208000000X	Pediatrics Physician	Primary	21570	CO

MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
01215706	Medicaid	CO	—

Copy-ready billing details

Provider: William Mitchell, MD
NPI: 1134202575
Taxonomy: 208000000X (Pediatrics Physician)
Address: 630 E HYMAN AVE, SUITE # 25, Aspen, CO, 81611

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1407032519	Daniel R. George	Organization	Specialist	Aspen, CO

Verify this record

Cross-check NPI 1134202575 against the authoritative CMS record: view Dr. William Dunn Mitchell on the official NPPES registry .

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is William Mitchell?

William Mitchell is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-01-24.