Dr. Mark D. Diamond, DO
- Medicare services, 2024
- 1,065
- Medicare patients, 2024
- 336
- Part D claims, 2024
- 349
- Hospital affiliations
- 4
- Industry payments
- $907
- Practice address
- 12251 South 80th Avenue, Palos Heights, IL 60463
- Practice phone
- Call (708) 923-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Diamond's professional email, personal email and mobile number
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Dr. Mark D. Diamond is a hospitalist in Palos Heights, Illinois
Dr. Diamond practices at Northwestern Medicine Palos Hospital in Palos Heights, Illinois, part of Northwestern Memorial HealthCare.
Dr. Diamond's NPI, 1265402804, was assigned on January 25, 2006. Dr. Diamond graduated from Chicago College of Osteopathy in 1993. Dr. Diamond holds Illinois license 036091440.
- NPI
- 1265402804NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9537143474
- NPI enumeration date
- January 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (708) 923-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark D. Diamond practices at Northwestern Medicine Palos Hospital in Palos Heights, Illinois
Dr. Diamond's primary practice is Northwestern Medicine Palos Hospital, at 12251 South 80th Avenue, Palos Heights, IL 60463 in Cook County. The practice phone is (708) 923-4000.
- Northwestern Medicine Palos Hospital12251 South 80th Avenue, Palos Heights, IL 60463 · Cook CountyPhone(708) 923-4000
Source: Dmand AI Affiliation Data
Dr. Mark D. Diamond is affiliated with 7 sites of care and 3 medical groups
Dr. Diamond's primary practice is Northwestern Medicine Palos Hospital in Palos Heights, Illinois, part of Northwestern Memorial HealthCare. Dr. Diamond is also affiliated with Northwestern Memorial Hospital. The medical group on file is DuPage Medical Group. Dmand AI also links Dr. Diamond to 2 more hospitals, 2 group practices and clinics, 2 medical groups and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark D. Diamond's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diamond practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Medicine Palos Hospital | Available with a free account |
| +6 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark D. Diamond is one of 1,321 hospitalists in Illinois
Hospitalist is Dr. Diamond's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Diamond is licensed in Illinois.
Specialties and state licenses
- Hospitalist, IllinoisPrimary
Hospitalists near Dr. Diamond
Counts of hospitalists 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 D. Diamond billed Medicare for 1,065 services in 2024
CMS data shows 1,065 Medicare services from Dr. Diamond across 6 procedure codes in 2024, for 336 Medicare patients. Medicare paid $103,333 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Diamond's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2162024: 1,06512%
Dr. Diamond compared with the Illinois median for hospitalists, 2024
- Dr. Diamond
- Illinois median
- Medicare services
- 1,065vs 54396% above
- Medicare patients
- 336vs 24239% above
- Part D claims
- 113vs 532.1 times
Medians across 1,248 hospitalists in Illinois with Dmand AI profiles that report each measure.
Dr. Diamond's 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark D. Diamond treated 336 Medicare patients in 2024, average age 80
CMS counts 336 Medicare patients who saw Dr. Diamond in 2024. The largest group is 85 and over, with 117 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 8% are also on Medicaid. Their average risk score is 2.18, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Diamond's median patient age at 79, with 54% women.
Dr. Diamond's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Diamond's Medicare patients by sex, 2024
- Women19859%
- Men13841%
Chronic conditions among Dr. Diamond's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis51%
- Chronic kidney disease50%
- Ischemic heart disease49%
- Heart failure46%
- Atrial fibrillation45%
- Anxiety39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Diamond's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark D. Diamond wrote 349 Medicare Part D claims in 2024
In 2024, Dr. Diamond wrote 349 Medicare Part D claims for 157 patients. 90% of them were for generic drugs. CMS names the drug for 113 of them, across 7 drugs with 11 or more claims each, at $7,411 in total drug cost. In 2023, CMS named 91 claims across 5 drugs.
Dr. Diamond's Part D claims by kind of drug, 2024
- Generic314 claims90%
- Brand-name and other35 claims10%
Dr. Diamond's most prescribed drugs by claims, 2024
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. Diamond's Part D claims, 2024
- Opioids9%30 of 349 claims
- Antibiotics17%61 of 349 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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 912024: 11324%
Drugs named by CMS: 7 in 2024, 5 in 2023.
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
How Dr. Mark D. Diamond takes part in Medicare
Dr. Diamond accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark D. Diamond received $907 in industry payments from 2016 to 2024
CMS Open Payments shows 53 general payments to Dr. Diamond from 5 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Novartis Pharmaceuticals Corporation paid the most, $525.
General payments to Dr. Diamond by program year, 2016 to 2024
Companies that paid Dr. Diamond the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark D. Diamond graduated from Chicago College of Osteopathy
Dr. Diamond graduated from Chicago College of Osteopathy in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark D. Diamond'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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 D. Diamond
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 D. Diamond's NPI number?
Dr. Mark D. Diamond's NPI number is 1265402804. It was assigned on January 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. Diamond?
Dr. Mark D. Diamond is a hospitalist in Palos Heights, Illinois. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Mark D. Diamond practice?
Dr. Diamond practices at 12251 South 80th Avenue, Palos Heights, IL 60463. Dr. Diamond's primary practice is Northwestern Medicine Palos Hospital in Palos Heights, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Diamond to 2 hospitals, 2 group practices and clinics, 2 medical groups and 1 hospice.
What is Dr. Mark D. Diamond's office phone number?
The practice phone on file for Dr. Diamond is (708) 923-4000.
What is Dr. Mark D. Diamond's medical license number?
Dr. Diamond holds Illinois license 036091440.
Which hospitals is Dr. Mark D. Diamond affiliated with?
Dr. Diamond practices at Northwestern Medicine Palos Hospital in Palos Heights, Illinois. Dr. Diamond is also affiliated with Northwestern Memorial Hospital. Dmand AI links Dr. Diamond to 2 more hospitals.
What medical group is Dr. Mark D. Diamond part of?
Dr. Diamond is linked to DuPage Medical Group. Dmand AI links Dr. Diamond to 2 more medical groups.
Does Dr. Mark D. Diamond accept Medicare?
Yes. CMS data shows Dr. Diamond billed Medicare for 1,065 services in 2024, and Dr. Diamond accepts Medicare assignment.
How many Medicare patients does Dr. Mark D. Diamond see?
CMS counts 336 Medicare patients who saw Dr. Diamond in 2024, with an average age of 80.
What services does Dr. Mark D. Diamond bill to Medicare?
In 2024, Dr. Diamond's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99239) and hospital inpatient care (99232).
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Where did Dr. Mark D. Diamond go to medical school?
Dr. Diamond graduated from Chicago College of Osteopathy in 1993.
What drugs does Dr. Mark D. Diamond prescribe most?
In 2024 Medicare Part D data, Dr. Diamond's most prescribed drugs by claims were Pantoprazole Sodium, Cephalexin and Furosemide.
Has Dr. Mark D. Diamond received payments from drug or device companies?
CMS Open Payments shows $907 in general payments to Dr. Diamond from 5 companies from 2016 to 2024. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Mark D. Diamond been practicing?
Dr. Diamond graduated from medical school in 1993, 33 years ago.
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