Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nicolaas Martin Grobler Jr., MD

Pulmonary Disease Physician in Upland, CA · enumerated 2006 · practices at Grobler Enterprises Inc.

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

National Provider Identifier

1720154255

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Registry record

Entity type Individual (Type 1)

Name Dr. Nicolaas Martin Grobler Jr.

Credential MD

Sex Male

Practice address 350 S Euclid Ave Ste C, Upland, CA, 91786

Phone (909) 591-6575

Enumeration date Nov 27, 2006

Last updated in NPPES Nov 16, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A89047 (CA) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A89047 (CA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A89047 (CA) Secondary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License A89047 (CA) 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
00A890470	Medicaid	CA	-

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

Where does Nicolaas Grobler practice?

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

What is the NPI number for Nicolaas Grobler?

The National Provider Identifier (NPI) for Nicolaas Grobler is 1720154255, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Grobler Enterprises Inc Internal Medicine Physician · Upland, CA NPI 1841430535 Melissa Kramer Primary Care Nurse Practitioner · Upland, CA NPI 1780447706

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-16.