Derek Walcker, PMHNP
NPI 1285286831 · Psychiatric/Mental Health Nurse Practitioner · Columbia, MD
Derek Walcker, PMHNP is a Psychiatric/Mental Health Nurse Practitioner provider in Columbia, MD (NPI 1285286831).
Provider details
- NPI number
- 1285286831
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PMHNP
- Sex
- Male
- Sole proprietor
- No
- License
- APRN.CNP.025119 (OH)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
6 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 59 |
| Clonidine Hcl | 26 |
| Amlodipine Besylate | 13 |
| Diazepam | 13 |
| Levothyroxine Sodium | 13 |
| Metformin Hclbrand: Metformin Hcl Er | 13 |
| Quetiapine Fumarate | 13 |
| Lithium Carbonate | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-07-14
- Last updated
- 2020-08-16
- Certified
- 2020-08-16
Frequently asked questions
- What is Derek Walcker's NPI number?
- Derek Walcker's National Provider Identifier (NPI) is 1285286831, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Walcker's specialty?
- Derek Walcker is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Derek Walcker located?
- Derek Walcker's practice location on file with NPPES is 5850 Waterloo Rd Ste 140, Columbia, MD 21045-1944.
- What is Derek Walcker's phone number?
- The practice phone number listed in the NPPES registry for Derek Walcker is (410) 988-2503.
- Is Derek Walcker's NPI active?
- Yes — Derek Walcker's NPI (1285286831) is active in the NPPES registry as of the last update on 2020-08-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.