Michael Muhonen, MD
Neurological Surgery · Orange, CANPI 1801804810
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $31,951 of the $45,518 with a category attached, or 70.2%. Biogen accounts for 69.3% of it on its own, with 12 other manufacturers making up the rest. Reporting peaked in 2019 at $32,029 and has fallen 99.6% since, to $118 in 2025.
Across 108 payments — averaging $421.46 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Biogen$32K
- Integra Lifesciences Corporation$10K
- Medtronic$3K
- Anuncia Medical Inc.$616
- Ipsen Biopharmaceuticals, Inc$280
- Osteomed LLC$130
- plus $181 from 7 others
Across 8 payments — averaging $1746.88 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Medtronic$14K
What the payments were for
- Consulting fees$31,95170%
- Speaking & faculty fees$1,3003%
- Travel & lodging$7,77917%
- Food & beverage$4,35810%
- Education$1300%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Biogen | 28 | $31,549 |
| Integra Lifesciences Corporation | 31 | $9,943 |
| Medtronic(2 entities) | 25 | $2,818 |
| Anuncia Medical Inc. | 2 | $616 |
| Ipsen Biopharmaceuticals, Inc | 12 | $280 |
| Osteomed LLC | 1 | $130 |
| Piramal Critical Care | 3 | $78 |
| Omniscient Neurotechnology America Ltd | 1 | $20 |
| Cook Medical LLC | 1 | $19 |
| Johnson & Johnson | 1 | $18 |
| Tersera Therapeutics LLC | 1 | $18 |
| Aesculap, Inc. | 1 | $15 |
| Kls-martin L.p. | 1 | $14 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- SPINRAZA$27,987
- CODMAN CERTAS$7,277
- DURASEAL EXACT$7,277
- CODMAN HAKIM PRECISION VALVE$7,277
- CUSA CLARITY$7,277
- SYNCHROMED$1,618
- INTEGRA$1,437
- ADVANCED WOUND CARE$1,426
- INTEGRA DERMAL REGENERATION TEMPLATE$479
- PRIMATRIX$479
- INTELLIS ADAPTIVESTIM$477
- SYNCHROMEDII$149
- NEURO-Neur$130
- STRATA$109
How this compares
$45,518 in reported general payments places this provider in the 80th percentile of 773 neurological surgery providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Other neurological surgery in Orange
- Christopher AmesSan Francisco$7.1M
- Larry KhooLos Angeles$2.8M
- Samy AbdouSan Diego$2.4M
- Bret AbshireMurrieta$2.3M
- William TaylorSan Diego$2.1M
- Tooraj GravoriEncino$2M
- Ali MesiwalaRancho Cucamonga$1.5M
- Joseph OsorioSan Diego$1.3M
- Ian JohnsonFresno$1.3M
- Aaron Cohen-GadolLos Angeles$1.3M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.