Quick answers
- Does Gillian L. Sowden accept Medicare assignment?
- Yes. Medicare's clinician data says Gillian L. Sowden 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 Gillian L. Sowden see?
- In 2024, CMS data shows 72 Original Medicare patients and 155 services for Gillian L. Sowden. This counts Original Medicare only and measures volume, not quality.
- What is Gillian L. Sowden's NPI number?
- 1720387202. 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 Gillian L. Sowden, 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 | 72 |
|---|---|
| Services billed to Medicare | 155 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 58 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)119 services
- Psychiatric diagnostic evaluation with medical services (90792)11 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 blood pressure51%
- Arthritis51%
- High cholesterol50%
- Diabetes24%
Hospitals where Gillian L. Sowden works
Medicare's Facility Affiliation Data lists Gillian L. Sowden at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Cheshire Medical CenterKeene, NH · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 300019
- Mary Hitchcock Memorial HospitalLebanon, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300003
Practice locations
Addresses where Gillian L. Sowden is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Medical Ctr DrLebanon, NH 03756 (603) 650‑5000
Group practices
Medicare enrollment lists Gillian L. Sowden as a member of these groups (CMS data updated October 2, 2026).
- Dartmouth-Hitchcock Clinic1,472 clinicians in the group
- Mary Hitchcock Memorial Hospital1,280 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Lebanon
Clinicians with the same Medicare primary specialty in Lebanon, NH — not a recommendation.
Other clinicians in Dartmouth-Hitchcock Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1720387202 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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