Quick answers
- Does Johanna D. Larrazabal accept Medicare assignment?
- Yes. Medicare's clinician data says Johanna D. Larrazabal 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 Johanna D. Larrazabal see?
- In 2024, CMS data shows 412 Original Medicare patients and 6,863 services for Johanna D. Larrazabal. This counts Original Medicare only and measures volume, not quality.
- What is Johanna D. Larrazabal's NPI number?
- 1588632574. 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 Johanna D. Larrazabal, 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 | 412 |
|---|---|
| Services billed to Medicare | 6,863 |
| Different services or procedures | 102 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)812 services
- Injection, methylprednisolone acetate, 1 mg (J1010)640 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)616 services
- Insertion of needle into vein for collection of blood sample (36415)562 services
- Blood test, comprehensive group of blood chemicals (80053)428 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 cholesterol75%
- High blood pressure71%
- Arthritis46%
- Osteoporosis26%
- Anxiety24%
- Diabetes22%
Hospitals where Johanna D. Larrazabal works
Medicare's Facility Affiliation Data lists Johanna D. Larrazabal 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.
- Riverside Doctors' Hospital of WilliamsburgWilliamsburg, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490143
- Riverside Regional Medical CenterNewport News, VA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 490052
- Riverside Walter Reed HospitalGloucester, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490130
- Sentara Careplex HospitalHampton, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490093
- Sentara Williamsburg Regional Medical CenterWilliamsburg, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490066
Practice locations
Addresses where Johanna D. Larrazabal is enrolled with Medicare (CMS data updated October 2, 2026).
- 5231 John Tyler HwyWilliamsburg, VA 23185 (757) 220‑8300
Group practices
Medicare enrollment lists Johanna D. Larrazabal as a member of this group (CMS data updated October 2, 2026).
- Riverside Physician Services Inc797 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Williamsburg
Clinicians with the same Medicare primary specialty in Williamsburg, VA — not a recommendation.
Other clinicians in Riverside Physician Services Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 (26 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) | 1588632574 |
| 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