Dr. John D. Merwin, MD
- Medicare services, 2024
- 92
- Medicare patients, 2024
- 182
- MIPS score, 2024
- 85
- Hospital affiliations
- 1
- Medical groups
- 4
- Practice address
- 1201 S Grand Blvd, Saint Louis, MO 63104
- Practice phone
- Call (314) 257-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. John D. Merwin is an anesthesiologist in Saint Louis, Missouri
Dr. Merwin practices at SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care.
Dr. Merwin's NPI, 1770562209, was assigned on January 12, 2006. Dr. Merwin graduated from University of Texas Medical School at San Antonio in 1985. Dr. Merwin holds Missouri license 100344.
- NPI
- 1770562209NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4183713506
- NPI enumeration date
- January 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 257-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John D. Merwin practices at SSM Health Saint Louis University Hospital in Saint Louis, Missouri
Dr. Merwin's primary practice is SSM Health Saint Louis University Hospital, at 1201 S Grand Blvd, Saint Louis, MO 63104 in St. Louis City. The practice phone is (314) 257-8000.
- SSM Health Saint Louis University Hospital1201 S Grand Blvd, Saint Louis, MO 63104 · St. Louis CityPhone(314) 257-8000
Source: Dmand AI Affiliation Data
Dr. John D. Merwin is affiliated with 3 sites of care and 4 medical groups
Dr. Merwin's primary practice is SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care. The medical group on file is SLUCare Physician Group. Dmand AI also links Dr. Merwin to 3 more medical groups, 1 behavioral health center and 1 group practice or clinic, 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. John D. Merwin's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Merwin practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| SSM Health Saint Louis University Hospital | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John D. Merwin is one of 819 anesthesiologists in Missouri
Anesthesiology is Dr. Merwin's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Merwin is licensed in Missouri.
Specialties and state licenses
- Anesthesiology, MissouriPrimary
Anesthesiologists near Dr. Merwin
Counts of anesthesiologists 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. John D. Merwin billed Medicare for 92 services in 2024
CMS data shows 92 Medicare services from Dr. Merwin across 2 procedure codes in 2024, for 182 Medicare patients. Medicare paid $5,996 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Merwin's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 1212024: 9224%
Dr. Merwin compared with the Missouri median for anesthesiologists, 2024
- Dr. Merwin
- Missouri median
- Medicare services
- 92vs 7523% above
- Medicare patients
- 182vs 14030% above
Medians across 839 anesthesiologists in Missouri with Dmand AI profiles that report each measure.
Dr. Merwin'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Merwin and other anesthesiologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John D. Merwin treated 182 Medicare patients in 2024, average age 70
CMS counts 182 Medicare patients who saw Dr. Merwin in 2024. The largest group is 65 to 74, with 81 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 35% are also on Medicaid. Their average risk score is 2.20, 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. Merwin's median patient age at 57, with 46% women.
Dr. Merwin's Medicare patients by age, 2024
Dr. Merwin's Medicare patients by sex, 2024
- Women9150%
- Men9150%
Chronic conditions among Dr. Merwin's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Arthritis49%
- Ischemic heart disease40%
- Anxiety38%
- Mood disorders38%
- Diabetes35%
- COPD34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Merwin's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John D. Merwin scored 85 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 85 out of 100 for Dr. Merwin for performance year 2024, reported as part of a group. Dr. Merwin accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Merwin's MIPS scores, performance year 2024
- 85of 100Final score
- 68.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 72of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John D. Merwin graduated from University of Texas Medical School at San Antonio
Dr. Merwin graduated from University of Texas Medical School at San Antonio in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John D. Merwin'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (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. John D. Merwin
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. John D. Merwin's NPI number?
Dr. John D. Merwin's NPI number is 1770562209. It was assigned on January 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John D. Merwin?
Dr. John D. Merwin is an anesthesiologist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. John D. Merwin practice?
Dr. Merwin practices at 1201 S Grand Blvd, Saint Louis, MO 63104. Dr. Merwin's primary practice is SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care. Dmand AI also links Dr. Merwin to 3 medical groups, 1 behavioral health center and 1 group practice or clinic.
What is Dr. John D. Merwin's office phone number?
The practice phone on file for Dr. Merwin is (314) 257-8000.
What is Dr. John D. Merwin's medical license number?
Dr. Merwin holds Missouri license 100344.
Which hospitals is Dr. John D. Merwin affiliated with?
Dr. Merwin practices at SSM Health Saint Louis University Hospital in Saint Louis, Missouri.
What medical group is Dr. John D. Merwin part of?
Dr. Merwin is linked to SLUCare Physician Group. Dmand AI links Dr. Merwin to 3 more medical groups.
Does Dr. John D. Merwin accept Medicare?
Yes. CMS data shows Dr. Merwin billed Medicare for 92 services in 2024, and Dr. Merwin accepts Medicare assignment.
What is Dr. John D. Merwin's MIPS score?
Dr. Merwin's MIPS final score for performance year 2024 is 85 out of 100, reported as part of a group.
How many Medicare patients does Dr. John D. Merwin see?
CMS counts 182 Medicare patients who saw Dr. Merwin in 2024, with an average age of 70.
Show 3 more questionsShow fewer questions
What services does Dr. John D. Merwin bill to Medicare?
In 2024, Dr. Merwin's most billed Medicare services were anesthesia (00731) and anesthesia (00811).
Where did Dr. John D. Merwin go to medical school?
Dr. Merwin graduated from University of Texas Medical School at San Antonio in 1985.
How long has Dr. John D. Merwin been practicing?
Dr. Merwin graduated from medical school in 1985, 41 years ago.
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