Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert Michael Stack, MD

Orthopaedic Surgery Physician in Las Cruces, NM · enumerated 2005 · practices at Las Cruces Orthopaedic Associates, PC.

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

National Provider Identifier

1134111461

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Registry record

Entity type Individual (Type 1)

Name Robert Michael Stack

Credential MD

Sex Male

Practice address 675 Avenida De Mesilla, Las Cruces, NM, 88005

Phone (505) 525-3535

Fax (505) 527-0217

Enumeration date Aug 23, 2005

Last updated in NPPES Oct 29, 2007

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 78268 (NM) Primary

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
26210	Other	NM	PRESBYTERIAN
16010	Other	NM	HMO
2666	Other	NM	BC BS
0761430001	Other	NM	DMERC
39445593	Other	NM	CHAMPUS
88005C005	Other	NM	TRICARE

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.

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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 Robert Stack?

Robert Stack is registered in NPPES with the primary taxonomy of Orthopaedic Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Las Cruces Orthopaedic Associates, PC Orthopaedic Surgery Physician · Las Cruces, NM NPI 1144212473 Wayne Lindsey Orthopaedic Surgery Physician · Las Cruces, NM NPI 1811978919 Paul Saiz Orthopaedic Surgery Physician · Las Cruces, NM NPI 1124076948 Michael Hamrick Nurse Practitioner · Las Cruces, NM NPI 1104126481

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-29.