Dr. John Ashton Armstrong , DO
Internal Medicine โข Rolla, MO
1050 W 10th St
Rolla, MO 654012905
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
-
Dr. John Armstrong is listed in NPPES under Internal Medicine.
-
NPI assigned on May 3, 2020; this date does not establish years in practice.
-
Published CMS data list 662 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.
-
Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 411 service units.
- 99215 โ Established patient outpatient office visit: 105 service units.
- G0439 โ Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit: 64 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 6 records in the table ยท Guide: How to read Medicare Part B data
-
Published CMS data list 3,142 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.
-
Published Part D records, 2024:
- Atorvastatin Calcium โ 167 prescription fills, including refills.
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) โ 146 prescription fills, including refills.
- Pantoprazole Sodium โ 132 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 90 records in the table ยท Guide: How to read Medicare Part D prescriber data
-
Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Missouri (2024, 1,304 clinicians with data). Median for this group: 636. Middle half: 273 to 1,166.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
-
Medicare Part B services went from 115 in 2023 to 662 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023โ2024.
Practice Location & Contact Primary Location
1050 W 10th St
Rolla, MO 654012905
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 3 distinct additional practice-address records in Rolla, MO; Waynesville, MO. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Pcrmc Medical Group Inc. 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
At Still University Of Health Sciences, College Of Osteo Med, Kirksville
2020
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
266 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 $68,046 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 $52,636 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
4,938 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
$153,207 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: $797.66 across 40 records.
By nature of payment
- Food and Beverage: $797.66 across 40 records.
Reporting-company totals (3 largest of 17)
- Dexcom, Inc.: $154.67 across 7 records.
- Novo Nordisk Inc: $85.49 across 4 records.
- Eli Lilly and Company: $77.66 across 4 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
6 years (graduated 2020)
CMS Doctors and Clinicians data list 2020 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
2020
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
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.
Enrolled in Medicare (PECOS)
Dr. Armstrong 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. Armstrong 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 Rolla and Missouri
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Internal Medicine in Missouri (2024, 1,304 clinicians with data). Median for this group: 636. Middle half: 273 to 1,166.
Too few clinicians listed under Internal Medicine in Rolla have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
Close to the middle for clinicians listed under Internal Medicine in Missouri (2024, 1,304 clinicians with data). Median for this group: $58,496. Middle half: $24,542 to $99,993.
Too few clinicians listed under Internal Medicine in Rolla have Medicare Part B data for 2024 to compare.
Paid by Medicare
Close to the middle for clinicians listed under Internal Medicine in Missouri (2024, 1,304 clinicians with data). Median for this group: $44,917. Middle half: $18,290 to $76,772.
Too few clinicians listed under Internal Medicine in Rolla have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Internal Medicine in Missouri (2024, 1,535 clinicians with data). Median for this group: 771. Middle half: 122 to 7,845.
Too few clinicians listed under Internal Medicine in Rolla have Medicare Part D data for 2024 to compare.
Part D drug cost
Close to the middle for clinicians listed under Internal Medicine in Missouri (2024, 1,535 clinicians with data). Median for this group: $59,863. Middle half: $2,451 to $575,890.
Too few clinicians listed under Internal Medicine in Rolla have Medicare Part D data for 2024 to compare.
13 active clinicians are listed under Internal Medicine with a practice address in Rolla, MO (2,605 in Missouri).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Rolla
0% of these 13 clinicians have the CMS telehealth indicator.
69.2% of these 13 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.
-
Medicare Part B services
Medicare Part B services increased 476% from 115 in 2023 to 662 in 2024.
- 2023: 115
- 2024: 662
-
Medicare-allowed amount
Medicare-allowed amount increased 485% from $11,641 in 2023 to $68,046 in 2024.
- 2023: $11,641
- 2024: $68,046
-
Paid by Medicare
Paid by Medicare increased 464% from $9,337 in 2023 to $52,636 in 2024.
- 2023: $9,337
- 2024: $52,636
-
Medicare Part D prescriptions
Medicare Part D prescriptions increased 3553% from 86 in 2021 to 3,142 in 2024.
- 2021: 86
- 2022: 68
- 2023: 98
- 2024: 3,142
-
30-day fills
30-day fills increased 3947% from 122 in 2021 to 4,938 in 2024.
- 2021: 122
- 2022: 123
- 2023: 146
- 2024: 4,938
-
Part D drug cost
Part D drug cost went from $616 in 2021 to $153,207 in 2024.
- 2021: $616
- 2022: $995
- 2023: $1,593
- 2024: $153,207
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $72.94 in 2023 to $797.66 in 2025.
- 2023: $72.94
- 2024: $634.98
- 2025: $797.66
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): 40 records totaling $797.66.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $28.86 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $28.49 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Wegovy | General | $28.23 |
| Corcept Therapeutics |
Food and Beverage
In-kind items and services
|
Korlym | General | $26.81 |
| Sumitomo Pharma America, Inc. |
Food and Beverage
In-kind items and services
|
GEMTESA | General | $25.04 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $24.83 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $24.24 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $24.08 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
|
TRELEGY ELLIPTA | General | $22.84 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $22.68 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Ozempic | General | $22.49 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $22.44 |
| Insulet Corporation |
Food and Beverage
Cash or cash equivalent
|
Omnipod | General | $22.37 |
| SCPHARMACEUTICALS INC. |
Food and Beverage
In-kind items and services
|
FUROSCIX | General | $22.01 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $21.13 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
VRAYLAR | General | $20.93 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
|
MOUNJARO | General | $20.75 |
| SCPHARMACEUTICALS INC. |
Food and Beverage
In-kind items and services
|
FUROSCIX | General | $20.67 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
|
Dexcom G6 Transmitter | General | $19.79 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
|
MOUNJARO | General | $19.49 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
JARDIANCE | General | $19.47 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Ozempic | General | $19.46 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
|
TRELEGY ELLIPTA | General | $19.41 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
|
LEQVIO | General | $19.36 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
|
MOUNJARO | General | $19.35 |
(top 25 shown)
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 2022โ2023 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, 2023โ2024; 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 |
|---|---|---|---|---|
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
411 | 204 | $97.80 | $90.67 |
|
99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
|
105 | 95 | $144.00 | $134.32 |
|
G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
|
64 | 64 | $322.00 | $117.29 |
|
99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
37 | 37 | $133.80 | $124.73 |
|
99495
Transitional care management services for problem of at least moderate complexity
|
34 | 27 | $141.00 | $130.43 |
|
99406
Smoking and tobacco use intensive counseling, 4-10 minutes
|
11 | 11 | $13.50 | $10.96 |
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 |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 167 | 9,706 | $921.36 | 51 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 146 | 2,928 | $3,380.20 | 72 |
| Pantoprazole Sodium | Pantoprazole Sodium | 132 | 7,234 | $1,168.05 | 46 |
| Levothyroxine Sodium | Levothyroxine Sodium | 127 | 8,066 | $1,986.74 | 44 |
| Losartan Potassium | Losartan Potassium | 124 | 5,936 | $681.16 | 28 |
| Gabapentin | Gabapentin | 84 | 4,011 | $1,688.29 | 36 |
| Amlodipine Besylate | Amlodipine Besylate | 77 | 5,252 | $315.71 | 35 |
| Furosemide | Furosemide | 74 | 2,852 | $208.98 | 34 |
| Tramadol Hcl | Tramadol Hcl | 67 | 1,382 | $560.35 | 35 |
| Escitalopram Oxalate | Escitalopram Oxalate | 65 | 2,874 | $426.56 | 21 |
| Lisinopril | Lisinopril | 64 | 3,813 | $304.58 | 22 |
| Metoprolol Succinate | Metoprolol Succinate | 62 | 3,544 | $565.37 | 18 |
| Azelastine Hcl | Azelastine Hcl | 61 | 2,570 | $1,625.33 | 31 |
| Carvedilol | Carvedilol | 60 | 2,465 | $228.48 | 15 |
| Potassium Chloride | Potassium Chloride | 59 | 2,912 | $924.27 | 31 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 58 | 1,322 | $1,032.77 | 27 |
| Omeprazole | Omeprazole | 57 | 3,754 | $918.26 | 20 |
| Fluticasone Propionate | Fluticasone Propionate | 54 | 2,453 | $1,123.03 | 31 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 52 | 2,940 | $539.66 | 14 |
| Tamsulosin Hcl | Tamsulosin Hcl | 49 | 2,530 | $427.47 | 19 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 47 | 1,276 | $338.71 | 24 |
| Prednisone | Prednisone | 46 | 699 | $123.68 | 35 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 44 | 825 | $732.14 | 25 |
| Metformin Hcl | Metformin Hcl | 42 | 2,688 | $261.25 | 20 |
| Fluoxetine Hcl | Fluoxetine Hcl | 42 | 1,500 | $134.77 | 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: 2024-02-27NUCC 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.
NUCC Taxonomy Code: 390200000X
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20230814001105
MO
5294197943
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
Pcrmc Medical Group Inc
1050 W 10th St, Rolla, MO 654012905
Phone: 5733649000
Secondary Practice Locations
817 Oak Knoll Rd
Rolla, MO 654014715
Phone: 5734660228
1000 W 10th St
Rolla, MO 654012905
Phone: 5733649000
1000 Gw Ln
Waynesville, MO 655832339
Phone: 5737742715
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 - Nephrology
Doctor of Medicine (M.D.)
Hospitalist
Doctor of Medicine (M.D.), Master of Public Health
Internal Medicine
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Nurse Practitioner - Adult Health
Adult Nurse Practitioner
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Internal Medicine (license number reported to NPPES: MO 2023028809)
Registered at 1050 W 10TH ST, ROLLA, MO 654012905 (Tel: 5733649000)
Registered at 1050 W 10TH ST, ROLLA, MO 654012905 (Tel: 5733649000)
NPI status registered as active in NPPES database
Registered at 817 OAK KNOLL RD, ROLLA, MO 654014715 (Tel: 5734660228)
Registered at 300 CARSON ST, JONESBORO, AR 724013104 (Tel: 8709107799)
Recorded as JOHN ARMSTRONG, DO
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Rolla
- Dr. Bohdan Lebedowicz, MD
- Dr. Donald James, DO
- Dr. Mahmoud Ballout, MD
- Dr. John Carr, MD
- Ravi Shankar Ranganatha
- Dr. Oluyomi Olusanya, MD
Mailing Address
1050 W 10th St
Rolla, MO 654012905
Phone: 5733649000