Katherine Ruiz-Mellott, M.D.,MPH
NPI 1962516864 · Psychiatry Physician · Haverhill, MA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Ruiz-Mellott, M.D.,MPH is a Psychiatry Physician provider in Haverhill, MA (NPI 1962516864).
Provider details
- NPI number
- 1962516864
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.,MPH
- Sex
- Female
- Sole proprietor
- No
- License
- 227275 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
301 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 198 | $82 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 35 | $124 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 32 | $52 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 20 | $176 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 16 | $86 |
Typical Medicare-allowed amounts for these services range $52–$176 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Olanzapine | 16 | 11 |
| Quetiapine Fumarate | 12 | — |
| Hydroxyzine Pamoate | 11 | 11 |
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 no Part D record, 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.
$22 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
- 2006-08-18
- Last updated
- 2009-09-21
Frequently asked questions
- What is Katherine Ruiz-Mellott's NPI number?
- Katherine Ruiz-Mellott's National Provider Identifier (NPI) is 1962516864, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Ruiz-Mellott's specialty?
- Katherine Ruiz-Mellott is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Ruiz-Mellott located?
- Katherine Ruiz-Mellott's practice location on file with NPPES is 76 Summer Street, Haverhill, MA 01830.
- What is Katherine Ruiz-Mellott's phone number?
- The practice phone number listed in the NPPES registry for Katherine Ruiz-Mellott is (978) 556-6229.
- Does Katherine Ruiz-Mellott accept Medicare?
- Katherine Ruiz-Mellott is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Ruiz-Mellott's NPI active?
- Yes — Katherine Ruiz-Mellott's NPI (1962516864) is active in the NPPES registry as of the last update on 2009-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.