Medicare Enrolled
Dr. Phillip Ahn, M.D.
Neurology · Los Angeles, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Ahn from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Ahn
Dr. Phillip Ahn is a neurology specialist in Los Angeles, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Ahn performed 15,856 Medicare services across 1,882 unique beneficiaries.
Between the years covered by Open Payments, Dr. Ahn received a total of $17,990 from 53 pharmaceutical and/or device companies across 475 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in neurology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Ahn is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 19 years in practice
▲ Top 7% volume in CA
$17,990 industry payments
Medicare Practice Summary
Medicare Utilization ↗15,856
Medicare services
Top 7% in CA for neurology
1,882
Unique beneficiaries
$23
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~835 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Botox injection, per unit An injection of onabotulinumtoxinA, a medication used to temporarily relax muscles or reduce gland activity. The dose is measured in units, with this code representing a single unit administered. |
7,140 | $5 | $15 |
| Botox injection (Xeomin), per unit An injection of incobotulinumtoxin A, a botulinum toxin type A product, administered in a quantity of one unit. |
5,690 | $4 | $15 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
1,202 | $77 | $170 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
320 | $78 | $200 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
216 | $110 | $245 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
205 | $141 | $365 |
| Electromyography of arm or leg muscles A test that measures the electrical activity in the muscles of the arm or leg using a needle electrode. It helps evaluate the health of muscles and the nerve cells that control them. |
153 | $90 | $190 |
| Awake and drowsy EEG A test that records electrical activity in the brain while the patient is awake and drowsy. |
81 | $363 | $780 |
| Visual evoked potential test A test that measures how quickly electrical signals travel from the eye to the brain in response to visual stimuli. |
81 | $62 | $150 |
| Digital analysis of brain wave activity (EEG) This procedure involves the digital analysis of brain wave activity recorded via an electroencephalogram (EEG). It focuses on the technical interpretation of the digital data rather than the initial recording or supervision. |
81 | $256 | $605 |
| Chemical nerve block for facial paralysis Injection of a chemical agent to paralyze specific nerves or muscles on the side of the face. |
80 | $122 | $305 |
| Neuropsychological test evaluation, first hour A professional assessment of cognitive and behavioral functioning using standardized tests. This service covers the initial hour of the evaluation process. |
80 | $111 | $320 |
| Psychological test administration, first 30 minutes A technician administers psychological or neuropsychological testing for the first 30 minutes. |
79 | $32 | $110 |
| Injection, mepivacaine hydrochloride, per 10 ml | 78 | $2 | $5 |
| Betamethasone steroid injection An injection containing a combination of betamethasone acetate and betamethasone sodium phosphate. |
75 | $5 | $10 |
| EEG, extended monitoring A test that records electrical activity in the brain while the patient is both awake and asleep. |
43 | $420 | $905 |
| Epidural steroid injection A continuous infusion of an anesthetic agent is injected into the lower back nerve bundle to provide pain relief. |
40 | $51 | $190 |
| Nerve conduction studies, 7-8 tests A series of 7 to 8 nerve conduction tests to evaluate how well nerves are sending signals to muscles. |
37 | $159 | $415 |
| Telephone medical discussion, 21-30 minutes A telephone conversation with a physician lasting between 21 and 30 minutes. This code covers the time spent discussing medical matters over the phone. |
37 | $108 | $250 |
| Injection of anesthetic or steroid into upper neck and back of head nerve An injection of an anesthetic agent and/or steroid into a nerve located in the upper neck and back of the head. |
36 | $66 | $210 |
| Nerve conduction study, 9-10 studies A diagnostic test that measures how well nerves send electrical signals. It involves performing 9 to 10 separate nerve conduction studies to evaluate nerve function. |
29 | $192 | $490 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
26 | $155 | $325 |
| Assessment of and care planning for patient with impaired thought processing, typically 60 minutes | 17 | $241 | $500 |
| Quadrivalent influenza vaccine, cell culture-derived A flu shot that protects against four strains of the influenza virus. It is produced using cell culture technology rather than traditional egg-based methods. |
15 | $32 | $40 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
15 | $34 | $60 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
Industry Payment Transparency
Open Payments through 2024 ↗$17,990
Total received (2018-2024)
Avg $2,570/year across 7 years
Top 16% in CA for neurology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
53
Companies
475
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$9,894 (55.0%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$5,773 (32.1%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$2,323 (12.9%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,119
2023
$6,638
2022
$1,774
2021
$1,707
2020
$1,296
2019
$3,685
2018
$1,772
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ABBVIE INC.
$245
Lilly USA, LLC
$153
PFIZER INC.
$103
Lundbeck LLC
$82
Merz Pharmaceuticals, LLC
$72
SK Life Science, Inc.
$64
Otsuka America Pharmaceutical, Inc.
$62
Averitas Pharma Inc.
$55
Eisai Inc.
$44
Neurelis, Inc.
$42
Neurocrine Biosciences, Inc.
$35
ACADIA Pharmaceuticals Inc
$34
Boston Scientific Corporation
$29
InSightec,Inc
$28
Sumitomo Pharma America, Inc.
$28
Biogen, Inc.
$24
SCILEX PHARMACEUTICALS INC.
$20
Top 3 companies account for 44.8% of 2024 payments
All-time payments by company (2018-2024) ›
SK Life Science, Inc.
$5,604
Amneal Pharmaceuticals LLC
$2,297
UCB, Inc.
$1,386
ACADIA Pharmaceuticals Inc
$1,049
Merz Pharmaceuticals, LLC
$581
Avanir Pharmaceuticals, Inc.
$516
ABBVIE INC.
$398
US WorldMeds, LLC
$395
Lilly USA, LLC
$393
PFIZER INC.
$368
Amgen Inc.
$344
Lundbeck LLC
$332
Allergan Inc.
$312
Supernus Pharmaceuticals, Inc.
$311
Alexion Pharmaceuticals, Inc.
$306
AbbVie Inc.
$301
Acorda Therapeutics, Inc
$279
SANOFI-AVENTIS U.S. LLC
$250
Neurocrine Biosciences, Inc.
$194
Allergan, Inc.
$190
Merz North America, Inc.
$172
MDD US Operations, LLC
$168
Boehringer Ingelheim Pharmaceuticals, Inc.
$156
Otsuka America Pharmaceutical, Inc.
$137
GENZYME CORPORATION
$131
Biogen, Inc.
$125
Impax Laboratories, Inc.
$106
Abbott Laboratories
$102
Biohaven Pharmaceutical Holding Company Ltd.
$80
Vertical Pharmaceuticals, LLC
$79
MERZ NORTH AMERICA, INC.
$77
Neurelis, Inc.
$71
Biohaven Pharmaceuticals, Inc.
$66
Eisai Inc.
$62
Boston Scientific Corporation
$59
Averitas Pharma Inc.
$55
Alnylam Pharmaceuticals Inc.
$52
Merck Sharp & Dohme Corporation
$50
Novartis Pharmaceuticals Corporation
$48
Corium, LLC
$48
Horizon Therapeutics plc
$44
Ipsen Biopharmaceuticals, Inc
$39
AstraZeneca Pharmaceuticals LP
$33
InSightec,Inc
$28
Sumitomo Pharma America, Inc.
$28
Teva Pharmaceuticals USA, Inc.
$27
ARGENX US, INC.
$27
GRT US Holding, Inc.
$25
EISAI INC.
$21
Sunovion Pharmaceuticals Inc.
$21
SCILEX PHARMACEUTICALS INC.
$20
Nestle HealthCare Nutrition Inc.
$15
ARBOR PHARMACEUTICALS, INC.
$14
Top 3 companies account for 51.6% of all-time payments
Associated products mentioned in payments ›
ADUHELM · AMYVID · APOKYN · APTIOM · AUBAGIO · AUSTEDO · Adlarity · Aimovig · BELSOMRA · BOTOX · BOTOX THERAPEUTIC · BRILINTA · Briviact · COLOGUARD · DYSPORT · EMGALITY · Exablate · Horizant · INBRIJA · INFINITY · INGREZZA · Infinity DBS Pulse Generators · JARDIANCE · KESIMPTA · KISUNLA · LEQEMBI · LINZESS · LYRICA · Leqembi · MYOBLOC · NAMZARIC · NORTHERA · NUEDEXTA · NUPLAZID · NURTEC ODT · Nuedexta · ONPATTRO · OSMOLEX ER · OXTELLAR XR · Ongentys · QULIPTA · QUTENZA · Qutenza · RELEXXII · REXULTI · REYVOW · RYTARY · SOLIQUA · SOLIRIS · Soliris · TROKENDI XR · UBRELVY · ULTOMIRIS · UPLIZNA · VALTOCO · VIBERZI · VRAYLAR · VYEPTI · VYVGART HYTRULO · Vimpat · XADAGO · XCOPRI · XEOMIN · Xadago · Xeomin · ZENPEP · ZTLido
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (55%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Neurologists within 10 mi
561
Per 100K population
5.7
County median income
$87,760
Nearest hospital
DOCS SURGICAL HOSPITAL
2.3 mi
2.3 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Ahn is a mixed practice specialist, with above-average Medicare volume (top 7% in CA), with low-engagement industry engagement in the top 16% of CA peers, with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Ahn experienced with botox injection, per unit?
Based on Medicare claims data, Dr. Ahn performed 7,140 botox injection, per unit services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Ahn receive payments from pharmaceutical companies?
Yes. Dr. Ahn received a total of $17,990 from 53 companies across 475 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Ahn's costs compare to other neurologists in Los Angeles?
Dr. Ahn's average Medicare payment per service is $23. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Ahn) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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