Dr. Diane Towako Siegel, MD
- Medicare services, 2024
- 1,257
- Medicare patients, 2024
- 487
- Part D claims, 2024
- 760
- Hospital affiliations
- 2
- Industry payments
- $1,591
- Practice address
- 1390 Dry Creek Dr, Longmont, CO 80503
- Practice phone
- Call (303) 682-3383
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Advanced Vision Surgery Center - Longmont
Surgery Center - Medicare-Certified · Longmont, Colorado
Find Dr. Siegel's professional email, personal email and mobile number
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Dr. Diane Towako Siegel is an ophthalmologist in Longmont, Colorado
Dr. Siegel practices at Advanced Vision Surgery Center - Longmont in Longmont, Colorado.
Dr. Siegel's NPI, 1316443914, was assigned on April 3, 2018. Dr. Siegel graduated from Emory University School of Medicine in 2018. Dr. Siegel holds Colorado license DR.0068751.
- NPI
- 1316443914NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7214288448
- NPI enumeration date
- April 3, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 682-3383
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Diane Towako Siegel practices at 2 locations in Longmont, Colorado
Dr. Siegel's primary practice is Advanced Vision Surgery Center - Longmont, at 1390 Dry Creek Dr, Longmont, CO 80503. The practice phone is (303) 682-3383. Dr. Siegel also practices at Advanced Vision Surgery Center LLC, 1400 Dry Creek Dr, Longmont, CO 80503.
- Advanced Vision Surgery Center - LongmontPrimary1390 Dry Creek Dr, Longmont, CO 80503Phone(303) 682-3383
- Advanced Vision Surgery Center LLC1400 Dry Creek Dr, Longmont, CO 80503 · Boulder CountyPhone(303) 682-3383
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Diane Towako Siegel is affiliated with 4 sites of care and 1 medical group
Dr. Siegel's primary practice is Advanced Vision Surgery Center - Longmont in Longmont, Colorado. Dr. Siegel is also affiliated with UCHealth Longs Peak Hospital. Dmand AI also links Dr. Siegel to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Diane Towako Siegel's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siegel practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Advanced Vision Surgery Center - Longmont | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Diane Towako Siegel is one of 258 ophthalmologists in Colorado
Ophthalmology is Dr. Siegel's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Siegel is licensed in Colorado.
Specialties and state licenses
- Ophthalmology, ColoradoPrimary
Ophthalmologists near Dr. Siegel
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Diane Towako Siegel billed Medicare for 1,257 services in 2024
CMS data shows 1,257 Medicare services from Dr. Siegel across 17 procedure codes in 2024, for 487 Medicare patients. Medicare paid $124,491 for them.
Dr. Siegel's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 6722024: 7339%
- Office and hospital visits
- 2023: 3902024: 35210%
- Surgery
- 2023: 2122024: 17219%
Where Dr. Siegel's Medicare services took place, 2024
- In an office1,10588%
- In a facility15212%
Dr. Siegel compared with the Colorado median for ophthalmologists, 2024
- Dr. Siegel
- Colorado median
- Medicare services
- 1,257vs 1,229Close to median
- Medicare patients
- 487vs 5389% below
- Part D claims
- 691vs 46648% above
Medians across 266 ophthalmologists in Colorado with Dmand AI profiles that report each measure.
Dr. Siegel's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Siegel and other ophthalmologists in Colorado.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Diane Towako Siegel treated 487 Medicare patients in 2024, average age 75
CMS counts 487 Medicare patients who saw Dr. Siegel in 2024. The largest group is 65 to 74, with 230 patients. 68% of them have high cholesterol, and 62% have high blood pressure. 8% are also on Medicaid. Their average risk score is 1.08, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Siegel's median patient age at 72, with 59% women.
Dr. Siegel's Medicare patients by age, 2024
Dr. Siegel's Medicare patients by sex, 2024
- Women29561%
- Men19239%
Chronic conditions among Dr. Siegel's Medicare patients, 2024
- High cholesterol68%
- High blood pressure62%
- Arthritis45%
- Ischemic heart disease25%
- Mood disorders24%
- Depression20%
- Diabetes19%
- Osteoporosis19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Siegel's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Diane Towako Siegel wrote 760 Medicare Part D claims in 2024
In 2024, Dr. Siegel wrote 760 Medicare Part D claims for 377 patients. 47% of them were for generic drugs. CMS names the drug for 691 of them, across 15 drugs with 11 or more claims each, at $131,030 in total drug cost. In 2023, CMS named 683 claims across 12 drugs.
Dr. Siegel's Part D claims by kind of drug, 2024
- Generic359 claims47%
- Brand-name401 claims53%
Dr. Siegel's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6832024: 6911%
Drugs named by CMS: 15 in 2024, 12 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Diane Towako Siegel ranks in the 86th percentile for cataract surgery in Medicare
Dr. Siegel accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 231 procedures of cataract surgery by Dr. Siegel, more than 86% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Siegel ranks in Medicare procedure volume
- Cataract surgery
- 86th percentile231 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Diane Towako Siegel received $1,591 in industry payments from 2022 to 2025
CMS Open Payments shows 46 general payments to Dr. Siegel from 13 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $370.
General payments to Dr. Siegel by program year, 2022 to 2025
Companies that paid Dr. Siegel the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Diane Towako Siegel graduated from Emory University School of Medicine
Dr. Siegel graduated from Emory University School of Medicine in 2018.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Diane Towako Siegel's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Diane Towako Siegel
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Diane Towako Siegel's NPI number?
Dr. Diane Towako Siegel's NPI number is 1316443914. It was assigned on April 3, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Diane Towako Siegel?
Dr. Diane Towako Siegel is an ophthalmologist in Longmont, Colorado. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Diane Towako Siegel practice?
Dr. Siegel practices at 1390 Dry Creek Dr, Longmont, CO 80503. Dr. Siegel also practices at 1400 Dry Creek Dr, Longmont, CO 80503. Dr. Siegel's primary practice is Advanced Vision Surgery Center - Longmont in Longmont, Colorado. Dmand AI also links Dr. Siegel to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Diane Towako Siegel's office phone number?
The practice phone on file for Dr. Siegel is (303) 682-3383.
What is Dr. Diane Towako Siegel's medical license number?
Dr. Siegel holds Colorado license DR.0068751.
Which hospitals is Dr. Diane Towako Siegel affiliated with?
Dr. Siegel is affiliated with UCHealth Longs Peak Hospital. Dmand AI links Dr. Siegel to 1 more hospital.
Does Dr. Diane Towako Siegel accept Medicare?
Yes. CMS data shows Dr. Siegel billed Medicare for 1,257 services in 2024, and Dr. Siegel accepts Medicare assignment.
How many Medicare patients does Dr. Diane Towako Siegel see?
CMS counts 487 Medicare patients who saw Dr. Siegel in 2024, with an average age of 75.
What services does Dr. Diane Towako Siegel bill to Medicare?
In 2024, Dr. Siegel's most billed Medicare services were eye exam or test (92014), office visit, established patient (99214) and eye exam or test (92250).
Where did Dr. Diane Towako Siegel go to medical school?
Dr. Siegel graduated from Emory University School of Medicine in 2018.
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What drugs does Dr. Diane Towako Siegel prescribe most?
In 2024 Medicare Part D data, Dr. Siegel's most prescribed drugs by claims were Prednisolone Acetate, Ketorolac Tromethamine and Latanoprost.
Has Dr. Diane Towako Siegel received payments from drug or device companies?
CMS Open Payments shows $1,591 in general payments to Dr. Siegel from 13 companies from 2022 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. Diane Towako Siegel been practicing?
Dr. Siegel graduated from medical school in 2018, 8 years ago.
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