Dr. Mark Blitstein , MD
Specialist • Lake Forest, IL
800 N Westmoreland Rd, Suite 102
Lake Forest, IL 600451673
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 4, 2006; this date does not establish years in practice.
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Published CMS data list 125 Original Medicare Part B services in 2019.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2019. Published rows only; this is not a quality measure.
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Published Part B service records, 2019:
- 45385 — Removal of polyps or growths of large bowel using an endoscope with mechanical snare: 76 service units.
- G0105 — Colorectal cancer screening; colonoscopy on individual at high risk: 19 service units.
- G0121 — Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk: 15 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2019. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2018 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2019). CPT notice
See all 4 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 116 Medicare Part D prescriptions, including refills, in 2019.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2019. Published rows only; this is not a quality measure.
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Published Part D records, 2019:
- Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) — 78 prescription fills, including refills.
- Gavilyte-N (Sodium Chloride/Nahco3/Kcl/Peg) — 38 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2019. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 132 in 2017 to 125 in 2019.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2019.
Practice Location & Contact Primary Location
800 N Westmoreland Rd
Suite 102
Lake Forest, IL 600451673
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-allowed amount
About $29,408 in 2019
The total amount Medicare approved for these services in 2019. 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, 2019.
Paid by Medicare
About $24,925 in 2019
The part of the Medicare-allowed amount that Medicare itself paid in 2019, 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, 2019.
30-day fills
116 standardized 30-day fills in 2019
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
$1,753 in 2019
The total cost of these prescriptions in 2019, 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, 2019.
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; 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.
Compared with the same specialty in Lake Forest and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Blitstein are from 2019.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Blitstein are from 2019.
9 active clinicians are listed under Specialist with a practice address in Lake Forest, IL (1,157 in Illinois).
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 varied from year to year: 132 in 2017 and 125 in 2019.
- 2017: 132
- 2018: 80
- 2019: 125
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Medicare-allowed amount
Medicare-allowed amount varied from year to year: $28,779 in 2017 and $29,408 in 2019.
- 2017: $28,779
- 2018: $16,307
- 2019: $29,408
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Paid by Medicare
Paid by Medicare varied from year to year: $25,411 in 2017 and $24,925 in 2019.
- 2017: $25,411
- 2018: $13,657
- 2019: $24,925
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 83% from 679 in 2015 to 116 in 2019.
- 2015: 679
- 2016: 140
- 2017: 96
- 2018: 79
- 2019: 116
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30-day fills
30-day fills decreased 90% from 1,125 in 2015 to 116 in 2019.
- 2015: 1,125
- 2016: 204
- 2017: 96
- 2018: 79
- 2019: 116
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Part D drug cost
Part D drug cost decreased 98% from $116,627 in 2015 to $1,753 in 2019.
- 2015: $116,627
- 2016: $3,338
- 2017: $1,523
- 2018: $2,350
- 2019: $1,753
Sources: CMS Medicare Physician & Other Practitioners (2019), CMS Medicare Part D Prescribers (2019), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2018 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, 2017–2019; 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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45385
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
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76 | 73 | $1535.00 | $290.55 |
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G0105
Colorectal cancer screening; colonoscopy on individual at high risk
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19 | 19 | $1258.00 | $212.29 |
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G0121
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk
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15 | 15 | $1258.00 | $212.98 |
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G0500
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito
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15 | 15 | $33.00 | $6.50 |
Source: CMS Part B by Provider and Service, 2019; 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 2019.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Peg 3350-Electrolyte | Sodium Chloride/Nahco3/Kcl/Peg | 78 | 111 | $1,231.23 | 77 |
| Gavilyte-N | Sodium Chloride/Nahco3/Kcl/Peg | 38 | 68 | $521.83 | 37 |
Source: CMS Part D by Provider and Drug, 2019; 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.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated January 04, 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 August 2026.
NPI Administrative Meta
Other Specialists in Lake Forest
Healthcare providers in Lake ForestMailing Address
800 N Westmoreland Rd, Suite 102
Lake Forest, IL 600451673
Phone: 8472951300