Dr. L. Douglas Marsh, MD
- Medicare services, 2019
- 629
- Part D claims, 2020
- 69
- Industry payments
- $179
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 33 S State St, Chicago, IL 60603
- Practice phone
- Call (877) 868-5351
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Signify Health Medical Associates - Chicago (S State St)
Primary care practice · Chicago, Illinois
Find Dr. Marsh's 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. L. Douglas Marsh is a general practice physician in Chicago, Illinois
Dr. Marsh practices at Signify Health Medical Associates - Chicago (S State St) in Chicago, Illinois.
Dr. Marsh's NPI, 1356335046, was assigned on September 8, 2005. Dr. Marsh holds Washington license 31623.
- NPI
- 1356335046NPI Registry (opens in a new tab)
- NPI enumeration date
- September 8, 2005
- NPI status
- Active
- Practice phone
- (877) 868-5351
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. L. Douglas Marsh practices at Signify Health Medical Associates - Chicago (S State St) in Chicago, Illinois
Dr. Marsh's primary practice is Signify Health Medical Associates - Chicago (S State St), at 33 S State St, Chicago, IL 60603. The practice phone is (877) 868-5351.
- Signify Health Medical Associates - Chicago (S State St)33 S State St, Chicago, IL 60603Phone(877) 868-5351
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. L. Douglas Marsh is affiliated with 1 site of care and 1 medical group
Dr. Marsh's primary practice is Signify Health Medical Associates - Chicago (S State St) in Chicago, Illinois. The medical group on file is Signify Health.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. L. Douglas Marsh's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marsh practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Signify Health Medical Associates - Chicago (S State St) | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. L. Douglas Marsh is one of 275 general practice physicians in Illinois
General practice is Dr. Marsh's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dr. Marsh is licensed in Washington.
Specialties and state licenses
- General practice, WashingtonPrimary
General practice physicians near Dr. Marsh
Counts of general practice physicians 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. L. Douglas Marsh billed Medicare for 629 services in 2019
CMS data shows 629 Medicare services from Dr. Marsh across 8 procedure codes in 2019. Medicare paid $15,162 for them. Every service was in an office.
Dr. Marsh's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 4862019: 33331%
- Drugs given in the office
- 2018: 1962019: 15819%
- Surgery
- 2018: 1192019: 8231%
- Lab and pathology
- 2018: 422019: 2833%
- Tests and treatments
- 2018: 442019: 2836%
- Imaging
- 2018: 142019: 0100%
Dr. Marsh compared with the Illinois median for general practice physicians, 2019
- Dr. Marsh
- Illinois median
- Medicare services
- 629vs 33091% above
- Part D claims
- 69vs 5623% above
Medians across 198 general practice physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Marsh's most billed Medicare procedure codes, 2019
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marsh and other general practice physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. L. Douglas Marsh's patients have a median age of 54
Across all payers, Dmand AI patient panel data puts Dr. Marsh's median patient age at 54, with 42% women.
Dr. Marsh's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 54
Patient panel by sex, all payers
- Women42%
- Men58%
Source: Dmand AI Patient Panel Data
Dr. L. Douglas Marsh wrote 69 Medicare Part D claims in 2020
In 2020, Dr. Marsh wrote 69 Medicare Part D claims. Every claim was for a generic drug. They cover 4 drugs, with $909 in total drug cost. In 2019, CMS named 1,117 claims across 45 drugs.
Dr. Marsh's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 1,1172020: 6994%
Drugs named by CMS: 4 in 2020, 45 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. L. Douglas Marsh received $179 in industry payments from 2016 to 2018
CMS Open Payments shows 12 general payments to Dr. Marsh from 8 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $40.
General payments to Dr. Marsh by program year, 2016 to 2018
Companies that paid Dr. Marsh the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. L. Douglas Marsh'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. L. Douglas Marsh
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. L. Douglas Marsh's NPI number?
Dr. L. Douglas Marsh's NPI number is 1356335046. It was assigned on September 8, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. L. Douglas Marsh?
Dr. L. Douglas Marsh is a general practice physician in Chicago, Illinois. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. L. Douglas Marsh practice?
Dr. Marsh practices at 33 S State St, Chicago, IL 60603. Dr. Marsh's primary practice is Signify Health Medical Associates - Chicago (S State St) in Chicago, Illinois.
What is Dr. L. Douglas Marsh's office phone number?
The practice phone on file for Dr. Marsh is (877) 868-5351.
What is Dr. L. Douglas Marsh's medical license number?
Dr. Marsh holds Washington license 31623.
What medical group is Dr. L. Douglas Marsh part of?
Dr. Marsh is linked to Signify Health.
Does Dr. L. Douglas Marsh accept Medicare?
Yes. CMS data shows Dr. Marsh billed Medicare for 629 services in 2019.
What services does Dr. L. Douglas Marsh bill to Medicare?
In 2019, Dr. Marsh's most billed Medicare services were office visit, established patient (99213), injected or infused drug (J3301) and surgery: heart and blood vessels (36415).
What drugs does Dr. L. Douglas Marsh prescribe most?
In 2020 Medicare Part D data, Dr. Marsh's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Metformin HCl.
Has Dr. L. Douglas Marsh received payments from drug or device companies?
CMS Open Payments shows $179 in general payments to Dr. Marsh from 8 companies from 2016 to 2018. The largest total came from Gilead Sciences, Inc.
How long has Dr. L. Douglas Marsh been practicing?
Dr. Marsh's NPI was assigned in 2005.
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