Karen Neiderer, PA-C
Physician Assistant · Baltimore, MD
Karen Neiderer, PA-C is a physician assistant with a practice address in Baltimore, Maryland, and NPI 1447790308, issued on Feb 27, 2017. Check the license (Maryland C0006397, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Karen Neiderer
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- C0006397 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1800 Orleans St, Baltimore, MD 21287
- Phone
- (410) 504-9540
- Enumerated
- Feb 27, 2017
- Record last updated
- Feb 18, 2025
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,224 in Maryland → Look up another NPI →
Also registered at 1800 Orleans St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kara AbarcarEmergency Medicine Physician1285195123
- Catherine Abbot, CRNPStudent in an Organized Health Care Education/Training Program1942093810
- Ahamed Akmal Abdul Rahman Lebbe, MDStudent in an Organized Health Care Education/Training Program1255208427
- Arielle AbovichStudent in an Organized Health Care Education/Training Program1972122703
- Luis Acosta, MDStudent in an Organized Health Care Education/Training Program1922859537
- Nihmotallahi Adebayo, MDStudent in an Organized Health Care Education/Training Program1033058334
Verify Karen Neiderer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license C0006397Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average physician assistant in 2024
195 Medicare Part D claims for 71 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 29 claims were for opioids.
Most prescribed
- Xarelto29 claims
- Oxycodone Hcl21 claims
- Clopidogrel19 claims
- Atorvastatin Calcium17 claims
- Eliquis15 claims
- Gabapentin13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Karen Neiderer among 3,224 physician assistant records in Maryland
Karen Neiderer, PA-C is one of 3,224 physician assistant records with a practice address in Maryland. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 52% of them.
- NPI issued2017 · 52% of these records are older, 43% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2025 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,135 physician assistant records list a practice address in Baltimore
They are 1,135 of the 35,183 NPPES records with a practice address in Baltimore, and 3,224 physician assistant records in Maryland.
All 3,224 in Maryland → Every provider in Baltimore → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Alice Armour, P.A.-C.Baltimore, MD 212871659336410
- Glenn Beauman, P.A.-C.Baltimore, MD 212871407811391
- Nancy Crawford, P.A.-C.Baltimore, MD 212871215985775
- Mandy David, P.A.-C.Baltimore, MD 212871902858715
- William Fleming, PA-CBaltimore, MD 212871477501385
- Karen Frangione, PACBaltimore, MD 212871639131634
- John Gerwig, P.A.-C.Baltimore, MD 212871750335105
- Rebecca Godfrey, P.A.-C.Baltimore, MD 212871255385522
Common questions
What is Karen Neiderer, PA-C's NPI number?
Karen Neiderer, PA-C's National Provider Identifier (NPI) is 1447790308, issued on Feb 27, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Karen Neiderer, PA-C located?
The NPPES record lists a practice address at 1800 Orleans St, Baltimore, MD, 21287. Phone: (410) 504-9540. Providers update this record themselves, so call before visiting.
How can I verify Karen Neiderer, PA-C's license?
NPPES lists Maryland license number C0006397, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Karen Neiderer, PA-C prescribe under Medicare Part D?
In 2024, Karen Neiderer, PA-C had 195 Medicare Part D claims for 71 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.