Dr. Grant C Olson , MD
Specialist • Denver, CO
125 Rampart Way, Suite 200
Denver, CO 802306406
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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NPI assigned on January 31, 2006; this date does not establish years in practice.
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Published CMS data list 2,000 Original Medicare Part B services in 2020.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020. Published rows only; this is not a quality measure.
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Published Part B service records, 2020:
- 95004 — Test for allergy using allergenic extract: 1,188 service units.
- 95117 — Professional service for multiple injections of allergen: 403 service units.
- 95115 — Professional service for single injection of allergen: 198 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2019 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2020). CPT notice
See all 8 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 196 Medicare Part D prescriptions, including refills, in 2021.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2021. Published rows only; this is not a quality measure.
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Published Part D records, 2021:
- Montelukast Sodium — 76 prescription fills, including refills.
- Symbicort (Budesonide/Formoterol Fumarate) — 33 prescription fills, including refills.
- Ipratropium Bromide — 19 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2021. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 8 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 4,651 in 2017 to 2,000 in 2020.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2020.
Practice Location & Contact Primary Location
125 Rampart Way
Suite 200
Denver, CO 802306406
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
139 people with Original Medicare in 2020
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2020.
Medicare-allowed amount
About $24,517 in 2020
The total amount Medicare approved for these services in 2020. 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 – by Provider and Service, 2020.
Paid by Medicare
About $15,266 in 2020
The part of the Medicare-allowed amount that Medicare itself paid in 2020, 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 – by Provider and Service, 2020.
30-day fills
303 standardized 30-day fills in 2021
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$27,750 in 2021
The total cost of these prescriptions in 2021, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2021.
Open Payments general payments, program year 2020
All general payments: $293.38 across 13 records.
By nature of payment
- Food and Beverage: $238.38 across 12 records.
- Education: $55.00 across 1 record.
Reporting-company totals (3 largest of 9)
- AstraZeneca Pharmaceuticals LP: $65.79 across 4 records.
- CSL Behring: $55.00 across 1 record.
- Pfizer Inc.: $42.85 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2020 (published June 30, 2026).
NPI first issued
2006
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, CMS release of October 2, 2026; Medicare.gov, “Does your provider accept Medicare as full payment?”
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, CMS release of October 2, 2026.
Compared with the same specialty in Denver and Colorado
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Olson are from 2020.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Olson are from 2021.
229 active clinicians are listed under Specialist with a practice address in Denver, CO (1,108 in Colorado).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Denver
0.9% of these 229 clinicians have the CMS telehealth indicator.
8.7% of these 229 clinicians are listed by CMS as accepting Medicare assignment.
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 decreased 57% from 4,651 in 2017 to 2,000 in 2020.
- 2017: 4,651
- 2018: 4,606
- 2019: 3,549
- 2020: 2,000
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Medicare-allowed amount
Medicare-allowed amount decreased 62% from $65,362 in 2017 to $24,517 in 2020.
- 2017: $65,362
- 2018: $65,379
- 2019: $52,189
- 2020: $24,517
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Paid by Medicare
Paid by Medicare decreased 68% from $47,958 in 2017 to $15,266 in 2020.
- 2017: $47,958
- 2018: $47,261
- 2019: $37,683
- 2020: $15,266
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 81% from 1,015 in 2017 to 196 in 2021.
- 2017: 1,015
- 2018: 1,211
- 2019: 1,417
- 2020: 1,461
- 2021: 196
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30-day fills
30-day fills decreased 79% from 1,415 in 2017 to 303 in 2021.
- 2017: 1,415
- 2018: 1,697
- 2019: 1,970
- 2020: 2,039
- 2021: 303
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Part D drug cost
Part D drug cost decreased 85% from $191,323 in 2017 to $27,750 in 2021.
- 2017: $191,323
- 2018: $272,065
- 2019: $275,342
- 2020: $296,056
- 2021: $27,750
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $846.08 in 2019 to $293.38 in 2020.
- 2019: $846.08
- 2020: $293.38
Sources: CMS Medicare Physician & Other Practitioners (2020), CMS Medicare Part D Prescribers (2021), CMS Open Payments (2020), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2020 (payments made January 1 – December 31, 2020): 13 records totaling $293.38.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| CSL Behring |
Education
In-kind items and services
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Hizentra | General | $55.00 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $26.70 |
| Pharming Healthcare, Inc. |
Food and Beverage
In-kind items and services
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RUCONEST | General | $25.84 |
| Grifols Shared Services North America, Inc. |
Food and Beverage
In-kind items and services
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Xembify | General | $22.46 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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EUCRISA | General | $22.26 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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EUCRISA | General | $20.59 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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SPIRIVA RESPIMAT | General | $20.50 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FASENRA | General | $19.18 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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XOLAIR | General | $18.88 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FASENRA | General | $15.78 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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SYMBICORT | General | $15.42 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FASENRA | General | $15.41 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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TRELEGY ELLIPTA | General | $15.36 |
Source: CMS Open Payments, program year 2020, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2019 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 – by Provider and Service data, 2017–2020; 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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95004
Test for allergy using allergenic extract
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1,188 | 23 | $11.00 | $4.39 |
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95117
Professional service for multiple injections of allergen
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403 | 28 | $25.00 | $10.97 |
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95115
Professional service for single injection of allergen
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198 | 18 | $20.00 | $9.63 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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120 | 87 | $119.47 | $65.10 |
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96160
Administration and interpretation of patient-focused health risk assessment
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28 | 24 | $6.00 | $2.61 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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27 | 27 | $175.00 | $99.08 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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19 | 19 | $175.00 | $91.17 |
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94375
Test to measure rate of airflow
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17 | 17 | $68.00 | $40.11 |
Source: CMS Part B by Provider and Service, 2020; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2021.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Montelukast Sodium | Montelukast Sodium | 76 | 4,180 | $1,298.45 | 29 |
| Symbicort | Budesonide/Formoterol Fumarate | 33 | 1,110 | $13,795.59 | — |
| Ipratropium Bromide | Ipratropium Bromide | 19 | 739 | $1,574.92 | — |
| Azelastine Hcl | Azelastine Hcl | 17 | 830 | $955.75 | — |
| Flovent Hfa | Fluticasone Propionate | 15 | 510 | $5,209.36 | — |
| Fluticasone Propionate | Fluticasone Propionate | 14 | 540 | $228.65 | — |
| Levocetirizine Dihydrochloride | Levocetirizine Dihydrochloride | 11 | 330 | $93.50 | — |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 11 | 750 | $4,593.92 | — |
Source: CMS Part D by Provider and Drug, 2021; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Specialist
Doctor of Medicine (M.D.)
Allergy & Immunology
Doctor of Medicine (M.D.)
Specialist
Doctor of Medicine (M.D.)
Specialist
Doctor of Medicine (M.D.)
Specialist
Physician Assistant (Certified)
Specialist
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated January 31, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to November 2026.
NPI Administrative Meta
Other Specialists in Denver
- Dr. David Johnson, MD
- Dr. John Bershof, MD
- Dr. William Schuh, MD
- Dr. Howard Kerstein, MD
- Dr. Jonathan Lee, MD
- Dr. Nunthaporn Laoprasert, MD
Mailing Address
1667 Cole Blvd, Bldg 19, Suite 200
Lakewood, CO 804013300
Phone: 3034203131