Medicare Enrolled
Dr. Matthew Koo, MD
Hematology (Pathology) Physician · 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. Koo 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 →
Are you Dr. Koo?
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What this data tells you about Dr. Koo
Dr. Matthew Koo is a hematology physician in Los Angeles, CA, with 12 years of NPI registration. Based on federal Medicare data, Dr. Koo performed 3,877 Medicare services across 1,120 unique beneficiaries.
Between the years covered by Open Payments, Dr. Koo received a total of $247 from 1 pharmaceutical and/or device company across 2 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology (pathology) physician. 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. Koo 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.
✓ 12 years in practice
▲ Top 5% volume in CA
$247 industry payments
Medicare Practice Summary
Medicare Utilization ↗3,877
Medicare services
Top 5% in CA for hematology (pathology) physician
1,120
Unique beneficiaries
$45
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~323 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 |
|---|---|---|---|
| Flow cytometry, additional marker An additional marker is tested during a flow cytometry procedure to analyze DNA or cells. This step adds specific data points to the initial analysis. |
1,593 | $21 | $265 |
| Tissue staining for diagnosis, additional An extra laboratory procedure to apply special stains to tissue slides for detailed examination. |
456 | $49 | $242 |
| Special tissue stain and interpretation A laboratory test using special stains to examine tissue samples, including the pathologist's review and written report of the findings. |
197 | $40 | $192 |
| Additional manual multiplex genetic stain A microscopic genetic analysis performed manually using an additional multiplex stain procedure on tissue. |
196 | $187 | $1,135 |
| Tissue pathology examination, moderate complexity A laboratory test where a pathologist examines tissue samples under a microscope to analyze cellular details. This intermediate complexity procedure involves specialized techniques to identify abnormalities in the tissue. |
190 | $45 | $248 |
| Tissue staining for diagnosis, initial A laboratory test where special stains are applied to tissue slides to help examine the cells and identify specific characteristics. |
127 | $59 | $264 |
| Manual microscopic genetic analysis of tumor A laboratory test that uses a microscope to manually examine tumor tissue for genetic changes. |
112 | $59 | $378 |
| Moderately high complexity pathology tissue examination A laboratory test where a pathologist examines tissue samples under a microscope to analyze cellular details. This specific level of complexity involves a moderate to high degree of technical skill and interpretation. |
98 | $70 | $192 |
| Flow cytometry DNA or cell analysis, first marker A laboratory test that uses a laser to analyze cells or DNA by detecting a specific marker on the cell surface or within the cell. |
78 | $71 | $435 |
| Flow cytometry, 16 or more markers A laboratory test that uses lasers to analyze cells or DNA using 16 or more different markers. This technique helps identify and characterize specific cell types based on their physical and chemical properties. |
77 | $72 | $457 |
| Computer-assisted microscopic genetic tumor analysis A laboratory test that uses computer technology to analyze tumor tissue at a microscopic level for genetic information. |
67 | $110 | $278 |
| Tissue preparation to remove calcium A laboratory procedure that removes calcium from a tissue sample to prepare it for microscopic examination. |
62 | $9 | $60 |
| Additional manual microscopic genetic analysis This procedure involves the manual microscopic examination of tissue samples to perform additional genetic analysis beyond the initial test. |
62 | $57 | $298 |
| Cell examination with selective cellular enhancement A laboratory test that examines cells from a specimen using a technique to selectively enhance specific cellular features for detailed analysis. |
52 | $24 | $60 |
| Limited pathology tissue examination A microscopic examination of tissue samples to identify abnormalities. This limited exam focuses on specific aspects of the tissue rather than a comprehensive analysis. |
51 | $3 | $10 |
| Serum protein measurement A blood test that measures the total amount of protein in the serum. It helps evaluate overall health and nutritional status. |
50 | $14 | $39 |
| Manual microscopic genetic analysis of tissue A laboratory test that manually examines tissue samples under a microscope to analyze genetic material. This initial procedure involves direct visual inspection to identify specific genetic characteristics. |
50 | $66 | $555 |
| Special stain test for organisms A laboratory test using special stains on tissue slides to identify microorganisms. The process includes the technical preparation of the slides and a professional interpretation of the results. |
48 | $23 | $63 |
| Serum immunofixation test A laboratory test that analyzes a blood serum sample to identify specific abnormal proteins. The procedure uses an immunologic technique to detect and characterize these proteins. |
39 | $15 | $39 |
| Genetic sequencing localization, initial procedure This procedure involves the initial process of localizing genetic sequencing. It identifies the specific location of genetic material for further analysis. |
35 | $107 | $489 |
| Pathology tissue examination, moderate complexity A laboratory test where a pathologist examines tissue samples under a microscope to identify abnormalities. This specific level indicates a moderate degree of complexity in the analysis. |
33 | $10 | $27 |
| Bone marrow smear interpretation A laboratory review of a bone marrow sample slide to examine cell structure and identify abnormalities. |
30 | $61 | $431 |
| Genetic test interpretation and report A healthcare provider reviews the results of genetic testing and provides a written report explaining the findings. |
26 | $29 | $175 |
| Blood smear interpretation with written report A physician examines a blood sample slide under a microscope to analyze blood cells. The doctor provides a written report of their findings. |
25 | $21 | $82 |
| Tissue culture for bone marrow and blood cell tumor disorders A laboratory test that grows bone marrow or blood cells in a culture to analyze tumor disorders. |
25 | $139 | $820 |
| Chromosome analysis for genetic defects A laboratory test that examines 15 to 20 cells to check for genetic defects in the chromosomes. |
25 | $122 | $810 |
| Immunologic analysis of body fluid with concentration A laboratory test that uses immunologic techniques to analyze a body fluid sample after it has been concentrated. |
20 | $15 | $39 |
| Fine needle aspirate evaluation and report A pathologist examines cells collected via a fine needle aspiration and provides a written interpretation and report of the findings. |
20 | $60 | $152 |
| Additional genetic sequencing localization This procedure involves additional genetic sequencing localization work beyond the initial test. It is performed to further analyze genetic material. |
20 | $29 | $187 |
| Microscopic tissue examination A pathologist examines a tissue sample under a microscope to identify abnormalities or disease. |
13 | $5 | $15 |
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 ↗$247
Total received (2022-2024)
Avg $124/year across 2 years
Bottom 40% in CA for hematology (pathology) physician
1
Company
2
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
$247 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$127
2022
$121
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Blueprint Medicines Corporation
$127
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2022-2024) ›
Blueprint Medicines Corporation
$247
Top 3 companies account for 100.0% of all-time payments
Associated products mentioned in payments ›
AYVAKIT
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 (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Hematology physicians within 10 mi
20
Per 100K population
0.2
County median income
$87,760
Nearest hospital
RONALD REAGAN UCLA MEDICAL CENTER
0.0 mi
0.0 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. Koo is a mixed practice specialist, with above-average Medicare volume (top 5% in CA), with low-engagement industry engagement.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Koo experienced with flow cytometry, additional marker?
Based on Medicare claims data, Dr. Koo performed 1,593 flow cytometry, additional marker 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. Koo receive payments from pharmaceutical companies?
Yes. Dr. Koo received a total of $247 from 1 company across 2 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. Koo's costs compare to other hematology physicians in Los Angeles?
Dr. Koo's average Medicare payment per service is $45. 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. Koo) 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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