Quick answers
- Does Nicolle S. Underwood accept Medicare assignment?
- Yes. Medicare's clinician data says Nicolle S. Underwood 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 Nicolle S. Underwood see?
- In 2024, CMS data shows 116 Original Medicare patients and 161 services for Nicolle S. Underwood. This counts Original Medicare only and measures volume, not quality.
- What is Nicolle S. Underwood's NPI number?
- 1881821122. 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 Nicolle S. Underwood, 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 | 116 |
|---|---|
| Services billed to Medicare | 161 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)114 services
- Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)13 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 pressure49%
- Arthritis48%
- Osteoporosis34%
- Anxiety26%
- Asthma18%
Hospitals where Nicolle S. Underwood works
Medicare's Facility Affiliation Data lists Nicolle S. Underwood 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.
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050678
- Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050603
Practice locations
Addresses where Nicolle S. Underwood is enrolled with Medicare (CMS data updated October 2, 2026).
- 1031 Avenida Pico, Suite 204San Clemente, CA 92673 (949) 829‑5533
- 4870 Barranca Pkwy, Suite 200Irvine, CA 92604 (949) 559‑4870
Group practices
Medicare enrollment lists Nicolle S. Underwood as a member of this group (CMS data updated October 2, 2026).
- Hoag Clinic460 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in San Clemente
Clinicians with the same Medicare primary specialty in San Clemente, CA — not a recommendation.
Other clinicians in Hoag Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 2009 (17 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881821122 |
| 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