Dr. Lynn M Larson , DO
Internal Medicine โข Owosso, MI
818 W King St Ste 101
Owosso, MI 488672159
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 June 15, 2007; this date does not establish years in practice.
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Published CMS data list 287 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:
- 99221 โ Initial hospital care with straightforward or low level of medical decision making, per day: 93 service units.
- 99348 โ Residence visit for established patient with low level of medical decision making, per day: 48 service units.
- 99231 โ Subsequent hospital care with straightforward or low level of medical decision making, per day: 42 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 7 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 1,842 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Trazodone Hcl โ 112 prescription fills, including refills.
- Levothyroxine Sodium โ 79 prescription fills, including refills.
- Atorvastatin Calcium โ 77 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 65 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 90% of clinicians listed under Internal Medicine in Owosso, MI (2024, 12 clinicians with data). Median for this group: 511. Middle half: 453 to 585.
Fewer Medicare Part B services than 65% of clinicians listed under Internal Medicine in Michigan (2024, 3,244 clinicians with data). Median for this group: 502. Middle half: 235 to 939.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 313 in 2020 to 287 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
818 W King St Ste 101
Owosso, MI 488672159
CMS Doctors and Clinicians lists 1 group name: Memorial Hospital. 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
2007
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
150 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 $27,048 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 $20,304 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.
30-day fills
1,946 standardized 30-day fills in 2024
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
$118,462 in 2024
The total cost of these prescriptions in 2024, 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 โ by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $296.70 across 14 records.
By nature of payment
- Food and Beverage: $296.70 across 14 records.
Reporting-company totals (3 largest of 9)
- ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.): $80.30 across 3 records.
- Eli Lilly and Company: $59.19 across 3 records.
- Otsuka America Pharmaceutical, Inc.: $53.35 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 2025 (published June 30, 2026).
Years since graduation
19 years (graduated 2007)
CMS Doctors and Clinicians data list 2007 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
2007
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
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Larson 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. Larson 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 Owosso and Michigan
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 90% of clinicians listed under Internal Medicine in Owosso, MI (2024, 12 clinicians with data). Median for this group: 511. Middle half: 453 to 585.
Fewer Medicare Part B services than 65% of clinicians listed under Internal Medicine in Michigan (2024, 3,244 clinicians with data). Median for this group: 502. Middle half: 235 to 939.
Medicare-allowed amount
A lower Medicare-allowed amount than 95% of clinicians listed under Internal Medicine in Owosso, MI (2024, 12 clinicians with data). Median for this group: $58,290. Middle half: $39,966 to $60,952.
A lower Medicare-allowed amount than 65% of clinicians listed under Internal Medicine in Michigan (2024, 3,244 clinicians with data). Median for this group: $45,163. Middle half: $22,487 to $79,883.
Paid by Medicare
A lower Medicare payment amount than 95% of clinicians listed under Internal Medicine in Owosso, MI (2024, 12 clinicians with data). Median for this group: $44,264. Middle half: $25,738 to $46,614.
A lower Medicare payment amount than 65% of clinicians listed under Internal Medicine in Michigan (2024, 3,244 clinicians with data). Median for this group: $34,631. Middle half: $16,935 to $61,333.
Medicare Part D prescriptions
Close to the middle for clinicians listed under Internal Medicine in Owosso, MI (2024, 13 clinicians with data). Median for this group: 362. Middle half: 104 to 3,433.
Close to the middle for clinicians listed under Internal Medicine in Michigan (2024, 3,463 clinicians with data). Median for this group: 801. Middle half: 94 to 5,032.
Part D drug cost
Close to the middle for clinicians listed under Internal Medicine in Owosso, MI (2024, 13 clinicians with data). Median for this group: $32,076. Middle half: $1,056 to $842,749.
Close to the middle for clinicians listed under Internal Medicine in Michigan (2024, 3,463 clinicians with data). Median for this group: $66,958. Middle half: $1,946 to $462,816.
15 active clinicians are listed under Internal Medicine with a practice address in Owosso, MI (5,741 in Michigan).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Owosso
26.7% of these 15 clinicians have the CMS telehealth indicator.
80% of these 15 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 varied from year to year: 313 in 2020 and 287 in 2024.
- 2020: 313
- 2021: 454
- 2022: 453
- 2023: 358
- 2024: 287
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Medicare-allowed amount
Medicare-allowed amount decreased 22% from $34,687 in 2020 to $27,048 in 2024.
- 2020: $34,687
- 2021: $47,300
- 2022: $45,845
- 2023: $34,142
- 2024: $27,048
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Paid by Medicare
Paid by Medicare decreased 22% from $26,173 in 2020 to $20,304 in 2024.
- 2020: $26,173
- 2021: $34,989
- 2022: $33,137
- 2023: $26,260
- 2024: $20,304
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 3738% from 48 in 2020 to 1,842 in 2024.
- 2020: 48
- 2021: 1,005
- 2022: 1,483
- 2023: 1,730
- 2024: 1,842
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30-day fills
30-day fills increased 3700% from 51 in 2020 to 1,946 in 2024.
- 2020: 51
- 2021: 1,172
- 2022: 1,596
- 2023: 1,851
- 2024: 1,946
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Part D drug cost
Part D drug cost went from $459 in 2020 to $118,462 in 2024.
- 2020: $459
- 2021: $32,078
- 2022: $54,101
- 2023: $93,023
- 2024: $118,462
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $17.91 in 2021 to $296.70 in 2025.
- 2021: $17.91
- 2024: $87.50
- 2025: $296.70
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), 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 2025 (payments made January 1 โ December 31, 2025): 14 records totaling $296.70.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
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CAPLYTA | General | $32.45 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
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REXULTI | General | $29.68 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
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CAPLYTA | General | $24.47 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
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ABILIFY MAINTENA | General | $23.67 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
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CAPLYTA | General | $23.38 |
| Corcept Therapeutics |
Food and Beverage
In-kind items and services
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Korlym | General | $23.17 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $20.84 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $20.09 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $18.26 |
| Exact Sciences Corporation |
Food and Beverage
In-kind items and services
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The Cologuard Plus Collection Kit | General | $17.80 |
| Antares Pharma, Inc. |
Food and Beverage
In-kind items and services
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XYOSTED | General | $16.95 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $15.85 |
| Esperion Therapeutics, Inc. |
Food and Beverage
In-kind items and services
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NEXLETOL | General | $15.32 |
| Collegium Pharmaceutical, Inc. |
Food and Beverage
Cash or cash equivalent
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Belbuca | General | $14.77 |
Source: CMS Open Payments, program year 2025, 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 2018โ2023 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, 2019โ2024; 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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99221
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes
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93 | 79 | $131.00 | $79.76 |
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99348
Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes
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48 | 17 | $151.00 | $73.23 |
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99231
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes
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42 | 34 | $61.76 | $47.54 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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41 | 30 | $276.59 | $170.78 |
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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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29 | 21 | $248.62 | $121.98 |
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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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18 | 15 | $92.00 | $75.56 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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16 | 15 | $212.63 | $138.68 |
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.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Trazodone Hcl | Trazodone Hcl | 112 | 2,742 | $763.67 | 27 |
| Levothyroxine Sodium | Levothyroxine Sodium | 79 | 2,429 | $820.20 | 14 |
| Atorvastatin Calcium | Atorvastatin Calcium | 77 | 2,313 | $847.84 | 12 |
| Citalopram Hbr | Citalopram Hydrobromide | 77 | 2,393 | $397.05 | 14 |
| Furosemide | Furosemide | 74 | 2,000 | $492.19 | 13 |
| Lisinopril | Lisinopril | 62 | 1,778 | $421.97 | โ |
| Mirtazapine | Mirtazapine | 62 | 2,770 | $1,851.97 | 18 |
| Quetiapine Fumarate | Quetiapine Fumarate | 58 | 1,745 | $741.03 | โ |
| Eliquis | Apixaban | 55 | 1,559 | $32,821.44 | โ |
| Metoprolol Tartrate | Metoprolol Tartrate | 54 | 1,616 | $424.47 | โ |
| Sertraline Hcl | Sertraline Hcl | 49 | 1,449 | $450.96 | โ |
| Amlodipine Besylate | Amlodipine Besylate | 47 | 1,637 | $316.29 | โ |
| Donepezil Hcl | Donepezil Hcl | 40 | 1,231 | $443.05 | โ |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 39 | 1,199 | $575.00 | โ |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 38 | 888 | $340.41 | โ |
| Memantine Hcl | Memantine Hcl | 37 | 1,400 | $809.75 | โ |
| Metformin Hcl | Metformin Hcl | 35 | 1,069 | $223.59 | โ |
| Single Use Swab | Alcohol Antiseptic Pads | 34 | 875 | $200.81 | โ |
| Gabapentin | Gabapentin | 31 | 896 | $329.56 | โ |
| Xarelto | Rivaroxaban | 30 | 860 | $17,256.54 | โ |
| Celecoxib | Celecoxib | 30 | 914 | $456.69 | โ |
| Escitalopram Oxalate | Escitalopram Oxalate | 28 | 897 | $295.54 | โ |
| Metoprolol Succinate | Metoprolol Succinate | 28 | 840 | $313.70 | โ |
| Pantoprazole Sodium | Pantoprazole Sodium | 28 | 899 | $364.47 | โ |
| Potassium Chloride | Potassium Chloride | 28 | 844 | $320.43 | โ |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2024-10-16NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20190111001101
MI
0941546907
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
Memorial Hospital
826 W King St, Owosso, MI 488672120
Phone: 9897235211
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Nurse Practitioner (Certified)
Family Medicine
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 818 W KING ST STE 101, OWOSSO, MI 488672159 (Tel: 9897294961)
Registered at 818 W KING ST STE 101, OWOSSO, MI 488672159 (Tel: 9897294961)
Registered at 818 W KING ST STE 103, OWOSSO, MI 488672159 (Tel: 9897294961)
Registered at 818 W KING ST STE 103, OWOSSO, MI 488672159 (Tel: 9897294961)
Registered at 1457 N M 52 STE 1, OWOSSO, MI 488671519 (Tel: 9897294961)
Registered at 1457 N M 52 STE 1, OWOSSO, MI 488671519 (Tel: 9897294961)
NPI status registered as active in NPPES database
Registered at 3857 COOPER ST, JACKSON, MI 492017547 (Tel: 5177805600)
Registered at 6452 MILLENNIUM STE 100, LANSING, MI 489177881 (Tel: 5178273149)
Recorded as LYNN LARSON, D.O.
Internal Medicine (license number reported to NPPES: MI 5101017147)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Owosso
- Dr. Martin Egenti, MD
- Dr. Fabian Nalichowski, MD
- Dr. Viorica Alawa, DO
- Dr. Madline Chembola, MD
- Dr. Wael Salman, MD
- Dr. Oscar Macal, MD
Mailing Address
818 W King St Ste 101
Owosso, MI 488672159
Phone: 9897294961