Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Andrew John Maclennan, M.D.
Hospitalist Physician in Denver, CO · enumerated 2008.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649430596
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Registry record
Entity type Individual (Type 1)
Name Dr. Andrew John Maclennan
Credential M.D.
Sex Male
Practice address 1375 E 19th Ave, Denver, CO, 80218
Phone (303) 338-4545
Enumeration date Jun 13, 2008
Last updated in NPPES Jul 27, 2021
Taxonomy & licenses
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 49625 (CO) Secondary
390200000X Student in an Organized Health Care Education/Training Program Student, Health Care · License 150188 (NC) Secondary
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 |
|---|---|---|---|
| 021729 | Other | CO | KAISER COMMERCIAL NUMBER |
| 72204567 | 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.
Frequently asked questions
What specialty is Andrew Maclennan?
Andrew Maclennan is registered in NPPES with the primary taxonomy of Hospitalist 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.
Other providers at this practice address
Browse all → Saint Joseph Hospital, Inc General Acute Care Hospital · Denver, CO NPI 1417946021 William Lee Nephrology Physician · Denver, CO NPI 1033194733 Michael Schneider Medical Physician Assistant · Denver, CO NPI 1447230800 Diogo Bauleth Hospitalist Physician · Denver, CO NPI 1265404685 Christopher North Surgical Physician Assistant · Denver, CO NPI 1760458145 Craig Robinson Physician Assistant · Denver, CO NPI 1114996527 Christine Zimmerman Certified Registered Nurse Anesthetist · Denver, CO NPI 1588603245 Saint Joseph Hospital, Inc Obstetrics & Gynecology Physician · Denver, CO NPI 1154361350
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-27.