Mercy Wainaina, DNP-PMHNP
NPI 1427605609 · Psychiatric/Mental Health Nurse Practitioner · Lynnwood, WA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mercy Wainaina, DNP-PMHNP is a Psychiatric/Mental Health Nurse Practitioner provider in Lynnwood, WA (NPI 1427605609).
Provider details
- NPI number
- 1427605609
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- DNP-PMHNP
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
462 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) |
|---|---|---|
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 232 | $51 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 230 | $81 |
Typical Medicare-allowed amounts for these services range $51–$81 (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 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lamotrigine | 185 | 28 |
| Quetiapine Fumarate | 127 | 19 |
| Bupropion Hclbrand: Bupropion Xl | 112 | 18 |
| Olanzapine | 104 | 24 |
| Aripiprazole | 80 | 14 |
| Gabapentin | 78 | 13 |
| Trazodone Hcl | 75 | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,158 across 99 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
- 2019-08-21
- Last updated
- 2022-06-02
- Certified
- 2021-03-15
Frequently asked questions
- What is Mercy Wainaina's NPI number?
- Mercy Wainaina's National Provider Identifier (NPI) is 1427605609, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mercy Wainaina's specialty?
- Mercy Wainaina is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mercy Wainaina located?
- Mercy Wainaina's practice location on file with NPPES is 4630 200th St Sw Ste F, Lynnwood, WA 98036-6608.
- What is Mercy Wainaina's phone number?
- The practice phone number listed in the NPPES registry for Mercy Wainaina is (425) 510-1196.
- Does Mercy Wainaina accept Medicare?
- Mercy Wainaina is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mercy Wainaina's NPI active?
- Yes — Mercy Wainaina's NPI (1427605609) is active in the NPPES registry as of the last update on 2022-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.