Dr. James Stewart Lang, MD
- Medicare services, 2024
- 1,092
- Medicare patients, 2024
- 148
- Part D claims, 2024
- 1,644
- Hospital affiliations
- 3
- Medical groups
- 5
- Practice address
- 1493 Cambridge Street, Cambridge, MA 02139
- Practice phone
- Call (617) 665-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. James Stewart Lang is an internist in Cambridge, Massachusetts
Dr. Lang practices at CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance.
Dr. Lang's NPI, 1528488798, was assigned on April 25, 2014. Dr. Lang holds Washington license MD61493634.
- NPI
- 1528488798NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092018721
- NPI enumeration date
- April 25, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 665-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James Stewart Lang practices at CHA Cambridge Hospital in Cambridge, Massachusetts
Dr. Lang's primary practice is CHA Cambridge Hospital, at 1493 Cambridge Street, Cambridge, MA 02139 in Middlesex County. The practice phone is (617) 665-1000.
- CHA Cambridge Hospital1493 Cambridge Street, Cambridge, MA 02139 · Middlesex CountyPhone(617) 665-1000
Source: Dmand AI Affiliation Data
Dr. James Stewart Lang is affiliated with 6 sites of care and 5 medical groups
Dr. Lang's primary practice is CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance. Dr. Lang is also affiliated with Massachusetts General Hospital. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Lang to 1 more hospital, 4 medical groups and 3 group practices and clinics, 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. James Stewart Lang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lang practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| CHA Cambridge Hospital | Available with a free account |
| +5 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James Stewart Lang is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Lang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Lang's licenses on file in 2 states: Washington and Massachusetts.
Specialties and state licenses
- Internal medicine, WashingtonPrimary
- Student in an organized health care education/training program, Massachusetts
Internists near Dr. Lang
Counts of internists 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. James Stewart Lang billed Medicare for 1,092 services in 2024
CMS data shows 1,092 Medicare services from Dr. Lang across 22 procedure codes in 2024, for 148 Medicare patients. Medicare paid $41,605 for them. Every service was in an office.
Dr. Lang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 02024: 549
- Office and hospital visits
- 2023: 252024: 220780%
- Surgery
- 2023: 02024: 184
- Other services
- 2023: 02024: 114
- Tests and treatments
- 2023: 02024: 25
Dr. Lang compared with the Massachusetts median for internists, 2024
- Dr. Lang
- Massachusetts median
- Medicare services
- 1,092vs 4312.5 times
- Medicare patients
- 148vs 19424% below
- Part D claims
- 1,147vs 4022.9 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Lang'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. James Stewart Lang treated 148 Medicare patients in 2024, average age 74
CMS counts 148 Medicare patients who saw Dr. Lang in 2024. The largest group is 65 to 74, with 70 patients. 72% of them have high blood pressure, and 68% have high cholesterol. Their average risk score is 1.07, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lang's median patient age at 58, with 56% women.
Dr. Lang's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lang's Medicare patients by sex, 2024
- Women9061%
- Men5839%
Chronic conditions among Dr. Lang's Medicare patients, 2024
- High blood pressure72%
- High cholesterol68%
- Arthritis39%
- Diabetes30%
- Chronic kidney disease27%
- Ischemic heart disease22%
- Mood disorders22%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James Stewart Lang wrote 1,644 Medicare Part D claims in 2024
In 2024, Dr. Lang wrote 1,644 Medicare Part D claims for 268 patients. 90% of them were for generic drugs. CMS names the drug for 1,147 of them, across 38 drugs with 11 or more claims each, at $60,933 in total drug cost. In 2023, CMS named 1,178 claims across 43 drugs.
Dr. Lang's Part D claims by kind of drug, 2024
- Generic1,475 claims90%
- Brand-name and other169 claims10%
Dr. Lang'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. Lang's Part D claims, 2024
- Opioids1%23 of 1,644 claims
- Antibiotics2%25 of 1,644 claims
- Antipsychotics, patients 65 and over1%15 of 1,644 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: 1,1782024: 1,1473%
Drugs named by CMS: 38 in 2024, 43 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
Dr. James Stewart Lang offers telehealth to Medicare patients
Dr. Lang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Lang as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Sources for Dr. James Stewart Lang'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) |
| 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. James Stewart Lang
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. James Stewart Lang's NPI number?
Dr. James Stewart Lang's NPI number is 1528488798. It was assigned on April 25, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. James Stewart Lang?
Dr. James Stewart Lang is an internist in Cambridge, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. James Stewart Lang practice?
Dr. Lang practices at 1493 Cambridge Street, Cambridge, MA 02139. Dr. Lang's primary practice is CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance. Dmand AI also links Dr. Lang to 1 hospital, 4 medical groups and 3 group practices and clinics.
What is Dr. James Stewart Lang's office phone number?
The practice phone on file for Dr. Lang is (617) 665-1000.
What is Dr. James Stewart Lang's medical license number?
Dr. Lang holds Washington license MD61493634, one of the licenses on file in 2 states.
Which states has Dr. James Stewart Lang been licensed in?
Dmand AI has state licenses on file for Dr. Lang in Washington and Massachusetts.
Which hospitals is Dr. James Stewart Lang affiliated with?
Dr. Lang practices at CHA Cambridge Hospital in Cambridge, Massachusetts. Dr. Lang is also affiliated with Massachusetts General Hospital. Dmand AI links Dr. Lang to 1 more hospital.
What medical group is Dr. James Stewart Lang part of?
Dr. Lang is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Lang to 4 more medical groups.
Does Dr. James Stewart Lang accept Medicare?
Yes. CMS data shows Dr. Lang billed Medicare for 1,092 services in 2024, and Dr. Lang accepts Medicare assignment.
Does Dr. James Stewart Lang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Lang as offering telehealth services.
Show 4 more questionsShow fewer questions
How many Medicare patients does Dr. James Stewart Lang see?
CMS counts 148 Medicare patients who saw Dr. Lang in 2024, with an average age of 74.
What services does Dr. James Stewart Lang bill to Medicare?
In 2024, Dr. Lang's most billed Medicare services were surgery: heart and blood vessels (36415), office visit, established patient (99214) and lab and pathology test (83036).
What drugs does Dr. James Stewart Lang prescribe most?
In 2024 Medicare Part D data, Dr. Lang's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
How long has Dr. James Stewart Lang been practicing?
Dr. Lang graduated from medical school in 2014, 12 years ago.
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