DR. LYNN M LARSON (D.O.) – Internal Medicine Physician, NPI 1104021765
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
7,218 INTERNAL MEDICINE in MI
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Provider Addresses for DR. LYNN M LARSON (D.O.)
6452 MILLENNIUM STE 100
LANSING, MI 489177881
Phone: (517) 827-3149
Fax: (615) 309-6512
Type: Mailing
Cooper Street, Lee's Summit, Jackson County, Missouri, 64063, United States
JACKSON, MI 492017547
Phone: (517) 780-5600
Fax: (615) 309-6512
Type: Location
818 W KING ST STE 101
OWOSSO, MI 488672159
Phone: (989) 729-4961
Fax: (989) 729-4958
Type: Mailing
1457 N M 52 STE 1
OWOSSO, MI 488671519
Phone: (989) 729-4961
Fax: (989) 729-4958
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $88.
Total Amount is formed as General ($88) + Research ($0) + Ownership ($0) = $88.
Last reported payment date: 2024-12-03 • Largest payer in this snapshot: VERTEX PHARMACEUTICALS INCORPORATED ($33).
Total Amount
$88
General + Research + Ownership
Payments
4
Total payment records
General Amount
$88
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-03
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| VERTEX PHARMACEUTICALS INCORPORATED | $33 |
| Lilly USA, LLC | $19 |
| ABBVIE INC. | $18 |
| Antares Pharma, Inc. | $18 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2019-01-11
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20190111001101 | I | Internal Medicine | MI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99348 | Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes | 83 | 28 | $0 |
| 99221 | Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 66 | 61 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 44 | 34 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 41 | 32 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 32 | 21 | $0 |
Insurance plans in this area (ZIP 48917)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | MI | |
| A N E S T H E S I O L O G Y | IL | |
| Internal Medicine | MI | |
| Nurse Practitioner | MI | |
| - | MI | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Physician Assistant | MI | |
| - | MI | |
| Physician Assistant | MI | |
| Physician Assistant | MI |
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