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ORTHOPAEDIC SPECIALTY INSTITUTE MEDICAL GROUP OF ORANGE COUNTY

PAC 5395631931 Physician group
PHYSICIAN ASSISTANT · ORANGE, CA · hospital-affiliated
Specialty PHYSICIAN ASSISTANT — most common member specialty (multi-specialty groups carry one label; see Methods)
Footprint Registered in ORANGE, CA · bills Medicare in 1 state (CA)
Scale 58 providers on the CMS registry roster · 239 codes billed (five-year data window) · 320,235 services (all billed codes, CY2024)
Medicare paid $10.7M · across all billed codes, CY2024, attributed & disclosed
Affiliation Hospital-affiliated — at least one member holds a hospital affiliation in the CMS registry
Contact (714) 634-4567 — CMS registry listing
CMS Doctors & Clinicians registry · Medicare Part B physician/supplier claims · figures are attributed (single-group clinicians) and disclosed fee-for-service — a subset, never complete totals · group series shown over the most recent 5 years (rosters archived from 2019)
Group analytics

Who's billing in this group, plus the paid volume analytics · CY2024

Clinician makeup · CY2024
Physicians 32Advanced-practice 17Other clinicians 0= 49 clinicians billed · CY2024
By clinician headcount, CY2024. 'Physician' follows Medicare's §1861(r) definition (MD/DO, podiatry, optometry, dental medicine, chiropractic); facility and supplier enrollments are not counted as clinicians. These 49 are the clinicians who billed in CY2024 — a subset of the all-time registry roster shown on the group's identity card.

Billed 186 of the group's 239 codes this year, across 1 state (CY2024).

The full analytics for this group

Premium

The billed-volume rank, trajectory, and economics behind this group — computed on the same disclosed Medicare Part B data.

What Medicare paid this group in CY2024 is on the group's identity card — free, on every tier. Premium breaks that figure down per code and per service, and puts the volume behind it in national and peer context.

  • Per-code payment breakdown & avg $/service — dollars behind the volume
  • Beneficiary-episode volume — reach, not just service counts
  • Office vs. facility setting mix — place-of-service code split
  • National billed-volume rank — percentile, cohort & year disclosed
  • Size-peer billed-volume benchmark — vs. groups of similar size
  • Top-3 clinician share — how volume distributes
  • 5-year volume trend — direction across the window
  • Business mix — largest codes by payment

Rank and benchmark figures are billed-volume positions among peers, not measures of care. All figures attributed (single-group clinicians) and disclosed Medicare Part B fee-for-service.

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Medicare Part B FFS · CY2024 · as published by CMS

Provider volumes, all codes · CY2024

NPIProviderCredentialsTypeCitySt Services (all codes) locked column
1508055393 Grumet, Robert M.D. Sports Medicine OrangeCA premium
1861848947 Nieto, Michael M.D. Pediatric Medicine OrangeCA premium
1659368777 Danto, Michael MD Physical Medicine and Rehabilitation OrangeCA premium
1992792097 Shepard, Michael MD Orthopedic Surgery OrangeCA premium
1689935355 Rivadeneyra, Adam MD Family Practice OrangeCA premium
1710181854 Park, Samuel MD Orthopedic Surgery Mission ViejoCA premium
1952481004 Fitzpatrick, Michael J MD Orthopedic Surgery Mission ViejoCA premium
1902828569 Le, Daniel M.D. Pain Management OrangeCA premium
1093904302 Elzik, Mark M.D. Orthopedic Surgery Mission ViejoCA premium
1821534934 Ly Zaragoza, Linda PA-C Physician Assistant OrangeCA premium
1598082919 Jillani, Asif M.D. Physical Medicine and Rehabilitation OrangeCA premium
1629257688 Smith, Jeremy M.D. Orthopedic Surgery OrangeCA premium
1407019391 Debottis, Daniel MD Orthopedic Surgery OrangeCA premium
1902243934 Parvaresh, Kevin M.D. Orthopedic Surgery OrangeCA premium
1972861540 Scudday, Travis M.D. Orthopedic Surgery OrangeCA premium
1124015235 Deckey, Jeffrey MD Orthopedic Surgery OrangeCA premium
1982900890 Patel, Jay M.D. Orthopedic Surgery OrangeCA premium
1538393889 Kang, Steve MD Orthopedic Surgery OrangeCA premium
1023263282 Mousavi, Shahryar MD Interventional Pain Management Laguna HillsCA premium
1205256229 Gittings, Daniel Orthopedic Surgery OrangeCA premium
1407131857 Boyer, Julia PA-C Physician Assistant OrangeCA premium
1093797367 Eidt, Herbert M.D. Orthopedic Surgery Mission ViejoCA premium
1114914397 Halikis, Mark MD Hand Surgery OrangeCA premium
1508084120 Franklin, Adam M.D. Orthopedic Surgery San ClementeCA premium
1518159961 Dinh, Paul M.D. Hand Surgery OrangeCA premium
1851827661 Haghverdian, Brandon M.D. Orthopedic Surgery OrangeCA premium
1245717024 Nguyen, Lillian PA-C Physician Assistant OrangeCA premium
1306853122 White, Jon M.D. Orthopedic Surgery OrangeCA premium
1285806091 Liauw, Jason M.D. Neurosurgery Laguna HillsCA premium
1215924592 Porter, Susanne NP Nurse Practitioner OrangeCA premium
1942440334 Mather, Treanna P.A. Physician Assistant OrangeCA premium
1023003605 Jackson, Robert M.D. Neurosurgery Laguna HillsCA premium
1790721025 Alexander, Gerald M.D. Orthopedic Surgery OrangeCA premium
1730317603 Wang, William M.D. Orthopedic Surgery Mission ViejoCA premium
1346722741 Terreros Ugarte, Christopher Physician Assistant OrangeCA premium
1699087908 Hwang, Brian MD Neurosurgery Laguna HillsCA premium
1083118616 Koressel, Joseph MD Orthopedic Surgery OrangeCA premium
1235295254 Johnson, Darin PA-C Physician Assistant Laguna HillsCA premium
1912689191 Mccloskey, Lindsey Nurse Practitioner IrvineCA premium
1154962066 Stauber, Haley Physician Assistant Laguna HillsCA premium
1326491440 Phillips, Joshua PA-C Physician Assistant OrangeCA premium
1871580159 Smith, David MD Orthopedic Surgery OrangeCA premium
1891151148 Dunauskas, Stefan Nurse Practitioner OrangeCA premium
1053947184 Mcilvaine, Shelby PA-C Physician Assistant OrangeCA premium
1073161071 Franco, Tayler PA-C Physician Assistant Newport BeachCA premium
1982305751 White, Alexandra PA-C Physician Assistant OrangeCA premium
1821646142 Nakahara, Alicia PA-C Physician Assistant OrangeCA premium
1275815987 Maciel, Courtney · member of 3 groups PA-C Physician Assistant Santa AnaCA premium
1801497771 Roughley, Matthew · member of 2 groups Physician Assistant OrangeCA premium

Volumes are attributed to a group only for clinicians affiliated with exactly one group. Clinicians in several groups are listed ("member of N groups") but shown as "—" — their volume is not attributed to any single group. A "—" on a single-group clinician means CMS suppressed the figure (fewer than 11 beneficiaries), never zero. Beneficiary-episodes count CMS's per-setting beneficiary figures, not unique patients. Average Medicare payment is the amount Medicare actually paid per service, weighted by service volume across office and facility settings. Where the roster is a single clinician, that clinician's service counts match the group's attributed volume shown on the ranked results, so they are shown here; the per-provider split across a larger roster is a premium feature. See Methods & Sources.