Derek N. Walcker, PMHNP
Psychiatric/Mental Health Nurse Practitioner · Columbia, MD
Derek N. Walcker, PMHNP is a psychiatric/mental health nurse practitioner with a practice address in Columbia, Maryland, and NPI 1285286831, issued on Jul 14, 2019. Check the license (Maryland R189093, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Derek N. Walcker
- Credential
- PMHNP
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License numbers
- R189093 MD
APRN.CNP.025119 OH
Self-reported in NPPES; status is on the state search - Practice location
- 5850 Waterloo RD Ste 140, Columbia, MD 21045
- Phone
- (410) 988-2503
- Enumerated
- Jul 14, 2019
- Record last updated
- Aug 16, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (410) 343-7899
- Medicare enrollment
- Enrolled (PECOS I20260316000375); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 2,373 in Maryland → Look up another NPI →
Also registered at 5850 Waterloo RD Ste 140
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shareese BarnesRegistered Nurse1659255263
- Lindsay Crow, PH.D.Psychologist1174969265
- Melissa Kramer, LCPCMental Health Counselor1982272332
- Laura Matney, NBHWCHealth & Wellness Coach1487571915
- Ava Williams, DNP, CRNP, FNP-BCFamily Nurse Practitioner1841693405
Verify Derek N. Walcker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license R189093Check 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 psychiatric/mental health nurse practitioner in 2024
204 Medicare Part D claims, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Clozapine59 claims
- Clonidine Hcl26 claims
- Amlodipine Besylate13 claims
- Diazepam13 claims
- Levothyroxine Sodium13 claims
- Metformin Hcl Er13 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.
Industry payments in 2024: $19.51
1 payment: food and beverage; the largest payer was Abbvie Inc. The 23,362 providers of this specialty with any payment received $1,027.77 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Derek N. Walcker among 2,373 psychiatric/mental health nurse practitioner records in Maryland
Derek N. Walcker, PMHNP is one of 2,373 psychiatric/mental health nurse practitioner records with a practice address in Maryland. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 33% of them.
- NPI issued2019 · 33% of these records are older, 61% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2019 · median 2021 among the 1,409 with a school on file
- Record last updated2020 · 19% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LP0808X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
102 psychiatric/mental health nurse practitioner records list a practice address in Columbia
They are 102 of the 6,690 NPPES records with a practice address in Columbia, and 2,373 psychiatric/mental health nurse practitioner records in Maryland.
All 2,373 in Maryland → Every provider in Columbia → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Naier Anhary, PMHNPColumbia, MD 210451689629552
- Katia Coley, NP-CColumbia, MD 210451770982241
- Benjamin Dahunsi, PMHNPColumbia, MD 210451225535206
- Veronica Kwegyir-Afful, NPColumbia, MD 210451689109795
- Elizabeth Noyes, PMHNP-BCColumbia, MD 210451639562317
- Favour OfoegbuColumbia, MD 210451891036604
- Olufunke Okegbenro, RN, CRNPColumbia, MD 210451174881411
- Felease Reed, CRNP-PMHColumbia, MD 210451417118795
Common questions
What is Derek N. Walcker, PMHNP's NPI number?
Derek N. Walcker, PMHNP's National Provider Identifier (NPI) is 1285286831, issued on Jul 14, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Derek N. Walcker, PMHNP located?
The NPPES record lists a practice address at 5850 Waterloo RD Ste 140, Columbia, MD, 21045. Phone: (410) 988-2503. Providers update this record themselves, so call before visiting.
How can I verify Derek N. Walcker, PMHNP's license?
NPPES lists Maryland license number R189093, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Derek N. Walcker, PMHNP prescribe under Medicare Part D?
In 2024, Derek N. Walcker, PMHNP had 204 Medicare Part D claims; the average among psychiatric/mental health nurse practitioner prescribers was 906. 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.