Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Allan L Liefer, M.D.
Surgery Physician in Chester, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1457336851
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Registry record
Entity type Individual (Type 1)
Name Dr. Allan L Liefer
Credential M.D.
Sex Male
Practice address 1900 State St, Chester, IL, 62233
Phone (618) 826-2388
Fax (618) 826-3194
Enumeration date Dec 8, 2005
Last updated in NPPES Jan 5, 2012
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 |
|---|---|---|---|
| 3646019 | 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
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 Allan Liefer?
Allan Liefer 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.
Other providers at this practice address
Browse all → Memorial Hospital Critical Access Hospital · Chester, IL NPI 1851390132 John Groll Cardiovascular Disease Physician · Chester, IL NPI 1396716163 Stephen Platt Family Medicine Physician · Chester, IL NPI 1720053077 Brett Prywitch Diagnostic Radiology Physician · Chester, IL NPI 1154387850 Joseph Molnar Family Medicine Physician · Chester, IL NPI 1306881412 James Krieg Family Medicine Physician · Chester, IL NPI 1851402390 Lisa Lowry-Rohlfing Family Medicine Physician · Chester, IL NPI 1386755973 Lee Love Mental Health Counselor · Chester, IL NPI 1902961808
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-05.