Dr. Mark O. Nichols, MD
- Medicare services, 2024
- 122
- Medicare patients, 2024
- 131
- Part D claims, 2024
- 22
- Hospital affiliations
- 1
- Industry payments
- $584
- Practice address
- 914 Pine Street, Mount Shasta, CA 96067
- Practice phone
- Call (530) 926-6111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nichols' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark O. Nichols is a general surgeon in Mount Shasta, California
Dr. Nichols practices at Dignity Health - Mercy Medical Center Mount Shasta in Mount Shasta, California, part of CommonSpirit Health.
Dr. Nichols' NPI, 1922196575, was assigned on October 10, 2006. Dr. Nichols graduated from Universidad Autonoma de Guadalajara in 1979. Dr. Nichols holds Montana license 12569.
- NPI
- 1922196575NPI Registry (opens in a new tab)
- NPI enumeration date
- October 10, 2006
- NPI status
- Active
- Practice phone
- (530) 926-6111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mark O. Nichols practices at Dignity Health - Mercy Medical Center Mount Shasta in Mount Shasta, California
Dr. Nichols' primary practice is Dignity Health - Mercy Medical Center Mount Shasta, at 914 Pine Street, Mount Shasta, CA 96067 in Siskiyou County. The practice phone is (530) 926-6111.
- Dignity Health - Mercy Medical Center Mount Shasta914 Pine Street, Mount Shasta, CA 96067 · Siskiyou CountyPhone(530) 926-6111
Source: Dmand AI Affiliation Data
Dr. Mark O. Nichols is affiliated with 1 site of care and 1 medical group
Dr. Nichols' primary practice is Dignity Health - Mercy Medical Center Mount Shasta in Mount Shasta, California, part of CommonSpirit Health. The medical group on file is San Francisco International Airport (SFO) Medical Clinic.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark O. Nichols' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nichols practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - Mercy Medical Center Mount Shasta | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark O. Nichols is one of 2,926 general surgeons in California
Surgery is Dr. Nichols' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Nichols is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Nichols' licenses on file in 3 states: Montana, California and Illinois.
Specialties and state licenses
- Surgery, MontanaPrimary
- California license
- Illinois license
Clinical focus
Dmand AI lists abdominal hernia repair surgery, cancerous skin growth removal, colonoscopy, gallbladder removal, gastrointestinal bleeding, gastrointestinal obstruction, groin hernia surgery and hemorrhoids among the conditions Dr. Nichols treats.
General surgeons near Dr. Nichols
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark O. Nichols billed Medicare for 122 services in 2024
CMS data shows 122 Medicare services from Dr. Nichols across 2 procedure codes in 2024, for 131 Medicare patients. Medicare paid $16,317 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nichols' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 1222024: 122No change
Dr. Nichols compared with the California median for general surgeons, 2024
- Dr. Nichols
- California median
- Medicare services
- 122vs 16627% below
- Medicare patients
- 131vs 1218% above
- Part D claims
- 15vs 3456% below
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Nichols' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Nichols?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nichols and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark O. Nichols treated 131 Medicare patients in 2024, average age 71
CMS counts 131 Medicare patients who saw Dr. Nichols in 2024. The largest group is 65 to 74, with 80 patients. 75% of them have high cholesterol, and 60% have high blood pressure. 19% are also on Medicaid. Their average risk score is 0.82, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nichols' median patient age at 49, with 56% women.
Dr. Nichols' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Nichols' Medicare patients by sex, 2024
- Women5542%
- Men7658%
Chronic conditions among Dr. Nichols' Medicare patients, 2024
- High cholesterol75%
- High blood pressure60%
- Arthritis37%
- Diabetes21%
- Anxiety18%
- Osteoporosis17%
- Ischemic heart disease15%
- Cancer14%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nichols' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 49
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark O. Nichols wrote 22 Medicare Part D claims in 2024
In 2024, Dr. Nichols wrote 22 Medicare Part D claims for 17 patients. 86% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $56 in total drug cost. In 2021, CMS named 20 claims across 1 drug.
Dr. Nichols' Part D claims by kind of drug, 2024
- Generic19 claims86%
- Brand-name and other3 claims14%
Dr. Nichols' most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nichols' Part D claims, 2024
- Opioids55%12 of 22 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 202022: 1525%
Drugs named by CMS: 1 in 2022, 1 in 2021.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Mark O. Nichols received $584 in industry payments from 2016 to 2021
CMS Open Payments shows 12 general payments to Dr. Nichols from 5 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 95% of the total. Intuitive Surgical, Inc. paid the most, $247.
General payments to Dr. Nichols by program year, 2016 to 2021
General payments to Dr. Nichols by kind, 2016 to 2021
- Food and beverage$55695%
- Travel and lodging$285%
Companies that paid Dr. Nichols the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark O. Nichols has 1 award and honors on record
Dmand AI lists 1 award for Dr. Nichols.
Awards and honors for Dr. Nichols
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Mark O. Nichols graduated from Universidad Autonoma de Guadalajara
Dr. Nichols graduated from Universidad Autonoma de Guadalajara in 1979. Dr. Nichols is a member of ACS and SLS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Mark O. Nichols accepts plans from 14 insurance carriers
Dr. Nichols is in network with 14 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Alliant Health Plans
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +6 more carriersWith a free account
Plan types Dr. Nichols accepts, by number of carriers
- PPO10
- Medicare7
- HMO6
- POS4
- EPO3
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark O. Nichols's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark O. Nichols
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark O. Nichols' NPI number?
Dr. Mark O. Nichols' NPI number is 1922196575. It was assigned on October 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark O. Nichols?
Dr. Mark O. Nichols is a general surgeon in Mount Shasta, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Mark O. Nichols practice?
Dr. Nichols practices at 914 Pine Street, Mount Shasta, CA 96067. Dr. Nichols' primary practice is Dignity Health - Mercy Medical Center Mount Shasta in Mount Shasta, California, part of CommonSpirit Health.
What is Dr. Mark O. Nichols' office phone number?
The practice phone on file for Dr. Nichols is (530) 926-6111.
What is Dr. Mark O. Nichols' medical license number?
Dr. Nichols holds Montana license 12569, one of the licenses on file in 3 states.
Which states has Dr. Mark O. Nichols been licensed in?
Dmand AI has state licenses on file for Dr. Nichols in Montana (2010 to 2026), California (1985 to 2025) and Illinois (1981 to 1987).
Which hospitals is Dr. Mark O. Nichols affiliated with?
Dr. Nichols practices at Dignity Health - Mercy Medical Center Mount Shasta in Mount Shasta, California.
What medical group is Dr. Mark O. Nichols part of?
Dr. Nichols is linked to San Francisco International Airport (SFO) Medical Clinic.
Does Dr. Mark O. Nichols accept Medicare?
Yes. CMS data shows Dr. Nichols billed Medicare for 122 services in 2024.
How many Medicare patients does Dr. Mark O. Nichols see?
CMS counts 131 Medicare patients who saw Dr. Nichols in 2024, with an average age of 71.
Show 7 more questionsShow fewer questions
Is Dr. Mark O. Nichols board certified?
Yes. Dr. Nichols is board certified in surgery by the American Board of Surgery.
What services does Dr. Mark O. Nichols bill to Medicare?
In 2024, Dr. Nichols' most billed Medicare services were surgery: digestive system (45380) and surgery: digestive system (45385).
Where did Dr. Mark O. Nichols go to medical school?
Dr. Nichols graduated from Universidad Autonoma de Guadalajara in 1979.
What drugs does Dr. Mark O. Nichols prescribe most?
In 2022 Medicare Part D data, Dr. Nichols' most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Mark O. Nichols received payments from drug or device companies?
CMS Open Payments shows $584 in general payments to Dr. Nichols from 5 companies from 2016 to 2021. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Mark O. Nichols been practicing?
Dr. Nichols graduated from medical school in 1979, 47 years ago.
What insurance does Dr. Mark O. Nichols accept?
Dr. Nichols is in network with 14 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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