Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. R Marshall Ackerman, MD
Specialist in Rockville, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1366417289
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Registry record
Entity type Individual (Type 1)
Name Dr. R Marshall Ackerman
Credential MD
Sex Male
Practice address 9601 Blackwell Rd Ste 100, Rockville, MD, 20850
Phone (301) 340-9200
Fax (301) 340-6934
Enumeration date Feb 22, 2006
Last updated in NPPES Mar 8, 2016
Taxonomy & licenses
207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License D0002443 (MD) Secondary
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 |
|---|---|---|---|
| 200008826 | Other | MD | MEDICARE RAILROAD |
| 0001 | Other | MD | BLUE SHIELD OF NCA |
| 410043 | Other | MD | BLUE SHIELD OF MARYLAND |
| 1080142007 | Other | MD | CIGNA |
| 492968 | Other | MD | NCPPO |
| 225302 | Other | MD | MAMSI |
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 NPI 1366417289 active?
Yes, as of the latest NPPES snapshot, NPI 1366417289 is active (record last updated 2016-03-08).
How do I verify R Ackerman's NPI record?
Cross-check NPI 1366417289 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Joseph Shrout Orthopaedic Surgery Physician · Rockville, MD NPI 1295719805 Brett Hampton Orthopaedic Surgery Physician · Rockville, MD NPI 1467420091 Jeffrey Witte Specialist · Rockville, MD NPI 1952343642 Steven Tuck Pediatric Orthopaedic Surgery Physician · Rockville, MD NPI 1124062104 Andrew Bender Specialist · Rockville, MD NPI 1326083312 Adedapo Ajayi Orthopaedic Surgery Physician · Rockville, MD NPI 1063775690 Jonathan Cui Orthopaedic Surgery Physician · Rockville, MD NPI 1730679119 Wendy Klecker Physical Therapy Assistant · Rockville, MD NPI 1932826021
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-03-08.