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Compare the published Medicare service mix of Karen Ann Schaaf, APRN with clinicians in the same registry specialty: Nurse Practitioner (CMS).

CA · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Robin Amidon

Nurse Practitioner (CMS) · Huntington Beach, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Hospital discharge day management, 30 minutes or less (99238)
70%Service-mix similarityView profile →

Phung Ngoc Phan

Nurse Practitioner (CMS) · Anaheim, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Hospital discharge day management, 30 minutes or less (99238)
70%Service-mix similarityView profile →

Sean Peng, NP

Nurse Practitioner (CMS) · Fresno, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Hospital discharge day management, 30 minutes or less (99238)
67%Service-mix similarityView profile →

Adaobi Ozoh, N.P

Nurse Practitioner (CMS) · Sherman Oaks, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Hospital discharge day management, 30 minutes or less (99238)
64%Service-mix similarityView profile →

Anna Katrina Cruz

Nurse Practitioner (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Hospital discharge day management, 30 minutes or less (99238)
61%Service-mix similarityView profile →

Dexter Dong, PMHNP

Nurse Practitioner (CMS) · San Diego, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
61%Service-mix similarityView profile →

Aaron Oliver

Specialty details in registry · Sacramento, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
58%Service-mix similarityView profile →

Ajmal Mohammad, N.P.

Nurse Practitioner (CMS) · Lawndale, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
56%Service-mix similarityView profile →

Robert Wayne Baker, N.P.

Nurse Practitioner (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
55%Service-mix similarityView profile →

Merrilyn Yang, PMHNP-BC

Nurse Practitioner (CMS) · Clearlake, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
55%Service-mix similarityView profile →

Cordelia Rose E Onyekwe, MSN

Nurse Practitioner (CMS) · Long Beach, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
53%Service-mix similarityView profile →

Edward Kim

Nurse Practitioner (CMS) · Torrance, CA

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
53%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.