Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mario Fernandes Chammas Jr., M.D.

Urology Physician in Denver, CO · enumerated 2007.

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

National Provider Identifier

1366643306

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Registry record

Entity type Individual (Type 1)

Name Dr. Mario Fernandes Chammas Jr.

Credential M.D.

Sex Male

Practice address 777 Bannock St, Denver, CO, 80204

Phone (303) 436-6563

Fax (303) 436-6572

Enumeration date May 29, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 45581 (CO) Primary

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

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 is the NPI number for Mario Chammas?

The National Provider Identifier (NPI) for Mario Chammas is 1366643306, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mario Chammas practice?

The practice location on file with NPPES is in Denver, CO. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Wing Hsieh Optometrist · Denver, CO NPI 1891799672 Teresa Wilcox Adult Health Nurse Practitioner · Denver, CO NPI 1316941735 Walter Biffl Surgery Physician · Denver, CO NPI 1962408260 Daniel Hammond Family Nurse Practitioner · Denver, CO NPI 1841296456 Elizabeth Cookson Psychiatry Physician · Denver, CO NPI 1508866831 Eric Peterson Family Medicine Physician · Denver, CO NPI 1639179989 Margaret Tomcho Pediatrics Physician · Denver, CO NPI 1528069457 Mark Berman Oral and Maxillofacial Surgery (Dentist) · Denver, CO NPI 1174524334

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.