Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John A. Greager II, MD
Surgery Physician in Lombard, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1427164722
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Registry record
Entity type Individual (Type 1)
Name Dr. John A. Greager II
Credential MD
Sex Male
Practice address 1263 S Highland Ave, Suite 100, Lombard, IL, 60148
Phone (630) 261-0280
Enumeration date Aug 21, 2006
Last updated in NPPES Oct 13, 2007
Taxonomy & licenses
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 |
|---|---|---|---|
| 3633645526052101 | Medicaid | IL | - |
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 John Greager?
John Greager is registered in NPPES with the primary taxonomy of Surgery 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 → Global Medical Care, Inc. Durable Medical Equipment & Medical Supplies · Lombard, IL NPI 1669517520 Cancer Therapy Associates Inc. Surgery Physician · Lombard, IL NPI 1669507034 Midwestern Surgical Services Ambulatory Surgical Clinic/Center · Lombard, IL NPI 1679691612 Joel Connelly Professional Counselor · Lombard, IL NPI 1497035224 Smiles on Wheels LLC Dental Clinic/Center · Lombard, IL NPI 1386056679 Chicago Home Caregivers In Home Supportive Care Agency · Lombard, IL NPI 1588042618
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-13.