Quick answers
- Does Katherine G. Ruiz Mellott accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine G. Ruiz Mellott accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Katherine G. Ruiz Mellott see?
- In 2024, CMS data shows 50 Original Medicare patients and 322 services for Katherine G. Ruiz Mellott. This counts Original Medicare only and measures volume, not quality.
- What is Katherine G. Ruiz Mellott's NPI number?
- 1962516864. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Katherine G. Ruiz Mellott, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 50 |
|---|---|
| Services billed to Medicare | 322 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 44 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)198 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)35 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)32 services
- Psychiatric diagnostic evaluation with medical services (90792)20 services
- Hospital discharge day management, 30 minutes or less (99238)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Depression75%
- Anxiety75%
- High cholesterol44%
- Asthma40%
- High blood pressure32%
Practice locations
Addresses where Katherine G. Ruiz Mellott is enrolled with Medicare (CMS data updated October 2, 2026).
- 300 S StChestnut Hill, MA 02467 (617) 469‑0300
Group practices
Medicare enrollment lists Katherine G. Ruiz Mellott as a member of this group (CMS data updated October 2, 2026).
- First Psychiatric Planners, Inc10 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Chestnut Hill
Clinicians with the same Medicare primary specialty in Chestnut Hill, MA — not a recommendation.
Other clinicians in First Psychiatric Planners, Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962516864 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians