Quick answers
- Does Sebastian G. Sepulveda accept Medicare assignment?
- Yes. Medicare's clinician data says Sebastian G. Sepulveda 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 Sebastian G. Sepulveda see?
- In 2024, CMS data shows 534 Original Medicare patients and 3,451 services for Sebastian G. Sepulveda. This counts Original Medicare only and measures volume, not quality.
- What is Sebastian G. Sepulveda's NPI number?
- 1558343129. 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 Sebastian G. Sepulveda, 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 | 534 |
|---|---|
| Services billed to Medicare | 3,451 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)1,553 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)494 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)457 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)207 services
- Hospital discharge day management, more than 30 minutes (99239)180 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).
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease65%
- Diabetes54%
- Arthritis47%
- Heart failure45%
Hospitals where Sebastian G. Sepulveda works
Medicare's Facility Affiliation Data lists Sebastian G. Sepulveda 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.
- Emerson Hospital -W Concord, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220084
- Lowell General HospitalLowell, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220063
Practice locations
Addresses where Sebastian G. Sepulveda is enrolled with Medicare (CMS data updated October 2, 2026).
- 295 Varnum AveLowell, MA 01854 (978) 937‑6439
- 9 N Rd, Unit 101Chelmsford, MA 01824 (978) 458‑2005
Group practices
Medicare enrollment lists Sebastian G. Sepulveda as a member of these groups (CMS data updated October 2, 2026).
- Lowell General Inpatient Specialists PLLC67 clinicians in the group
- Commonwealth Medical Practice LLC2 clinicians in the group
Specialties
- Internal Medicineprimary
- Nephrologyalso
Other internal medicine doctors in Lowell
Clinicians with the same Medicare primary specialty in Lowell, MA — not a recommendation.
Other clinicians in Lowell General Inpatient Specialists PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558343129 |
| 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