Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Charles W Graeber, MD
Nephrology Physician in Naples, FL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1801867452
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Registry record
Entity type Individual (Type 1)
Name Charles W Graeber
Credential MD
Sex Male
Practice address 311 9th St N Ste 100, Naples, FL, 34102
Phone (239) 624-0940
Fax (239) 624-0941
Enumeration date Jan 31, 2006
Last updated in NPPES Jul 21, 2022
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 |
|---|---|---|---|
| 1205772 | Medicaid | CT | - |
| 018238900 | Medicaid | FL | - |
| IX06N | Other | FL | BCBS |
| IQ727Z | Other | FL | MEDICARE |
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 Charles Graeber?
Charles Graeber is registered in NPPES with the primary taxonomy of Nephrology 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 → Ricardo Franco Sadud Hospitalist Physician · Naples, FL NPI 1982621777 Rocco Santarelli Pulmonary Disease Physician · Naples, FL NPI 1619997608 Tracy Walsh Internal Medicine Physician · Naples, FL NPI 1316250103 Rebecca Witherell Infectious Disease Physician · Naples, FL NPI 1477993855 Jeffrey Howland Internal Medicine Physician · Naples, FL NPI 1811375728 Carlan Bostick Surgical Physician Assistant · Naples, FL NPI 1578234803 Cagla Kitapli Internal Medicine Physician · Naples, FL NPI 1548081912
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.