Mark Davis, PMHNP-BC
NPI 1265296412 · Psychiatric/Mental Health Nurse Practitioner · Walla Walla, WA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Davis, PMHNP-BC is a Psychiatric/Mental Health Nurse Practitioner provider in Walla Walla, WA (NPI 1265296412).
Provider details
- NPI number
- 1265296412
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PMHNP-BC
- Sex
- Male
- Sole proprietor
- Yes
- License
- AP61526319 (WA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
2 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
50 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 50 | $108 |
Typical Medicare-allowed amounts for these services range $108–$108 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 36 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Olanzapine | 93 | 18 |
| Quetiapine Fumarate | 81 | 19 |
| Sertraline Hcl | 65 | 13 |
| Aripiprazole | 57 | 13 |
| Clonazepam | 52 | 11 |
| Benztropine Mesylate | 47 | 13 |
| Haloperidol Decanoate | 42 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,130 across 26 records (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
- 2024-02-08
- Last updated
- 2024-02-08
- Certified
- 2024-01-30
Frequently asked questions
- What is Mark Davis's NPI number?
- Mark Davis's National Provider Identifier (NPI) is 1265296412, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Davis's specialty?
- Mark Davis is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Davis located?
- Mark Davis's practice location on file with NPPES is 1520 Kelly Pl, Walla Walla, WA 99362-8607.
- What is Mark Davis's phone number?
- The practice phone number listed in the NPPES registry for Mark Davis is (509) 575-4084.
- Does Mark Davis accept Medicare?
- Mark Davis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Davis's NPI active?
- Yes — Mark Davis's NPI (1265296412) is active in the NPPES registry as of the last update on 2024-02-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.