Dr. Timothy Leonor Tan , DO
Pathology - Dermatopathology โข Seattle, WA
2815 Eastlake Ave E Ste 240
Seattle, WA 981023086
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Timothy Tan is listed in NPPES under Pathology - Dermatopathology.
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NPI assigned on May 14, 2013; this date does not establish years in practice.
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Published CMS data list 832 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 88305 โ Pathology examination of tissue using a microscope, intermediate complexity: 682 service units.
- 88342 โ Special stained specimen slides to examine tissue, initial procedure: 84 service units.
- 88341 โ Special stained specimen slides to examine tissue, each additional procedure: 32 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 5 records in the table ยท Guide: How to read Medicare Part B data
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Medicare Part B services went from 45 in 2020 to 832 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
2815 Eastlake Ave E Ste 240
Seattle, WA 981023086
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 4 distinct additional practice-address records in Ann Arbor, MI; Beaverton, OR; Chicago, IL and 1 more. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 3 distinct group names: Christina G Steil Dermatology Ltd; Curtis T. Thompson, M.D. And Associates, Pllc; Deerfield Dermatology Associates, Ltd.. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Midwestern University, Chicago College Of Osteopathic Med
2013
What Public CMS Data Show
Pathology - Dermatopathology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
485 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $55,176 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $42,430 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $229.00 in 2022
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2022.
Years since graduation
13 years (graduated 2013)
CMS Doctors and Clinicians data list 2013 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2013
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Tan has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Tan as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Seattle and Washington
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Not enough clinicians listed under Pathology - Dermatopathology in Washington have Medicare Part B data for 2024 to make a comparison.
Medicare-allowed amount
Not enough clinicians listed under Pathology - Dermatopathology in Washington have Medicare Part B data for 2024 to make a comparison.
Paid by Medicare
Not enough clinicians listed under Pathology - Dermatopathology in Washington have Medicare Part B data for 2024 to make a comparison.
5 active clinicians are listed under Pathology - Dermatopathology with a practice address in Seattle, WA (8 in Washington).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 1749% from 45 in 2020 to 832 in 2024.
- 2020: 45
- 2021: 675
- 2022: 243
- 2023: 983
- 2024: 832
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Medicare-allowed amount
Medicare-allowed amount increased 2564% from $2,071 in 2020 to $55,176 in 2024.
- 2020: $2,071
- 2021: $42,961
- 2022: $8,920
- 2023: $67,129
- 2024: $55,176
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Paid by Medicare
Paid by Medicare increased 2472% from $1,650 in 2020 to $42,430 in 2024.
- 2020: $1,650
- 2021: $33,530
- 2022: $6,481
- 2023: $49,425
- 2024: $42,430
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $162.67 in 2019 to $229.00 in 2022.
- 2019: $162.67
- 2021: $13.83
- 2022: $229.00
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Open Payments (2022), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2022 (payments made January 1 โ December 31, 2022): fewer than 11 records totaling $229.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Foundation Medicine, Inc. |
Food and Beverage
In-kind items and services
|
FOUNDATIONONE CDX | General | $229.00 |
Source: CMS Open Payments, program year 2022, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2019โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2020โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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88305
Pathology examination of tissue using a microscope, intermediate complexity
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682 | 475 | $185.11 | $59.46 |
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88342
Special stained specimen slides to examine tissue, initial procedure
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84 | 72 | $214.90 | $106.39 |
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88341
Special stained specimen slides to examine tissue, each additional procedure
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32 | 17 | $184.47 | $90.81 |
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88312
Special stained specimen slides to identify organisms including interpretation and report
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20 | 16 | $253.48 | $113.34 |
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88304
Pathology examination of tissue using a microscope, moderately low complexity
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14 | 13 | $75.24 | $36.78 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-11-26NUCC Taxonomy Code: 207ZD0900X
A dermatopathologist is an expert in diagnosing and monitoring diseases of the skin including infectious, immunologic, degenerative, and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings, and smears of skin lesions by means of light microscopy, electron microscopy, and fluorescence microscopy.
NUCC Taxonomy Code: 207ZP0102X
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
NUCC Taxonomy Code: 207ZP0102X
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PATHOLOGY
I20251210000697
OR
7719223999
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Curtis T. Thompson, M.d. And Associates, Pllc
9750 Sw Nimbus Ave, Beaverton, OR 970087172
Phone: 5039067300
Deerfield Dermatology Associates, Ltd.
36100 N Brookside Dr, Gurnee, IL 600314572
Phone: 8474800004
Curtis T. Thompson, M.d. And Associates, Pllc
3135 S State St, Ann Arbor, MI 481081653
Phone: 5039067300
Christina G Steil Dermatology Ltd
125 W 2nd St, Hinsdale, IL 605214014
Phone: 6304550045
Secondary Practice Locations
9750 Sw Nimbus Ave
Beaverton, OR 970087172
Phone: 5039067300
3131 S State St Ste 309
Ann Arbor, MI 481081658
Phone: 5032458219
1633 Medical Center Pt
Colorado Springs, CO 809075700
Phone: 5039067300
251 E Huron St
Chicago, IL 606112908
Phone: 3129262000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Dentist - Oral and Maxillofacial Pathology
Doctor of Dental Surgery, Master of Public Health
Pathology - Dermatopathology
Doctor of Medicine (M.D.)
Pathology - Dermatopathology
Doctor of Osteopathic Medicine (D.O.)
Pathology - Dermatopathology
Doctor of Medicine (M.D.)
Dentist - Oral and Maxillofacial Pathology
Dentist - Oral and Maxillofacial Pathology
Doctor of Dental Medicine, Master of Science
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 2815 EASTLAKE AVE E STE 240, SEATTLE, WA 981023086 (Tel: 5039067300)
Registered at PO BOX 230457, PORTLAND, OR 972810457 (Tel: 5039067300)
Pathology (license number reported to NPPES: IL 125064426)
Pathology (license number reported to NPPES: IN 02007763A)
NPI status registered as active in NPPES database
Registered at 251 E HURON ST, CHICAGO, IL 606112908 (Tel: 3129262000)
Registered at 251 E HURON ST, CHICAGO, IL 606112908 (Tel: 3129262000)
Recorded as TIMOTHY TAN, D.O.
Pathology (license number reported to NPPES: IL 125064426)
NPI status registered as active in NPPES database
Registered at 4502 MEDICAL DR, SAN ANTONIO, TX 782294402 (Tel: 2105674724)
Registered at 7703 FLOYD CURL DR, SAN ANTONIO, TX 782293901
Recorded as TIMOTHY TAN, D.O.
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Pathology - Dermatopathology Specialists in Seattle
Healthcare providers in SeattleMailing Address
Po Box 230457
Portland, OR 972810457
Phone: 5039067300