Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Andrew B. Ziller

Emergency Medicine Physician in Denver, CO · enumerated 2006 · practices at Questcare Obstetrics Colorado LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1528046638

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Registry record

Entity type Individual (Type 1)

Name Andrew B. Ziller

Sex Male

Practice address 4567 E. 9th Avenue, Denver, CO, 80220

Phone (303) 320-2455

Fax (303) 306-7753

Enumeration date Jan 9, 2006

Last updated in NPPES Jul 14, 2015

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 29691 (CO) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License DR.0029691 (CO) Primary

Other identifiers

Identifier	Type	State	Issuer
930041495	Other	CO	RAILROAD MEDICARE
01296912	Medicaid	CO	-

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 → Validate an NPI →

Frequently asked questions

What specialty is Andrew Ziller?

Andrew Ziller is registered in NPPES with the primary taxonomy of Emergency Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-14.