Dr. Larissa C. Day Walz, MD
- Medicare services, 2024
- 1,102
- Medicare patients, 2024
- 283
- Part D claims, 2024
- 5,461
- Hospital affiliations
- 5
- Industry payments
- $13
- Practice address
- 2001 W 86th St, Indianapolis, IN 46260
- Practice phone
- Call (317) 338-2172
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension St Vincent Hospital- Indianapolis
Indianapolis, Indiana
Find Dr. Day Walz'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. Larissa C. Day Walz is an internist in Indianapolis, Indiana
Dr. Day Walz practices at Ascension St Vincent Hospital- Indianapolis in Indianapolis, Indiana.
Dr. Day Walz's NPI, 1316114770, was assigned on May 14, 2008. Dr. Day Walz graduated from Indiana University School of Medicine in 2007. Dr. Day Walz holds Indiana license 01068078A.
- NPI
- 1316114770NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789715814
- NPI enumeration date
- May 14, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (317) 338-2172
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Larissa C. Day Walz practices at Ascension St Vincent Hospital- Indianapolis in Indianapolis, Indiana
Dr. Day Walz's primary practice is Ascension St Vincent Hospital- Indianapolis, at 2001 W 86th St, Indianapolis, IN 46260 in Marion County. The practice phone is (317) 338-2172.
- Ascension St Vincent Hospital- Indianapolis2001 W 86th St, Indianapolis, IN 46260 · Marion CountyPhone(317) 338-2172
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Larissa C. Day Walz is affiliated with 9 sites of care and 2 medical groups
Dr. Day Walz's primary practice is Ascension St Vincent Hospital- Indianapolis in Indianapolis, Indiana. Dr. Day Walz is also affiliated with IU Health Methodist Hospital. The medical group on file is IU Health Medical Group. Dmand AI also links Dr. Day Walz to 4 more hospitals, 2 group practices and clinics, 1 home health agency and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Larissa C. Day Walz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Day Walz practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension St Vincent Hospital- Indianapolis | Available with a free account |
| +8 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Larissa C. Day Walz is one of 1,987 internists in Indiana
Internal medicine is Dr. Day Walz's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Day Walz is licensed in Indiana.
Specialties and state licenses
- Internal medicine, IndianaPrimary
Internists near Dr. Day Walz
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. Larissa C. Day Walz billed Medicare for 1,102 services in 2024
CMS data shows 1,102 Medicare services from Dr. Day Walz across 14 procedure codes in 2024, for 283 Medicare patients. Medicare paid $57,488 for them. Every service was in an office.
Dr. Day Walz's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5412024: 5086%
- Tests and treatments
- 2023: 1812024: 1852%
- Surgery
- 2023: 1502024: 1585%
- Drugs given in the office
- 2023: 802024: 9316%
- Other services
- 2023: 942024: 8015%
- Lab and pathology
- 2023: 612024: 7828%
Dr. Day Walz compared with the Indiana median for internists, 2024
- Dr. Day Walz
- Indiana median
- Medicare services
- 1,102vs 5202.1 times
- Medicare patients
- 283vs 21233% above
- Part D claims
- 4,860vs 15930.6 times
Medians across 1,948 internists in Indiana with Dmand AI profiles that report each measure.
Dr. Day Walz'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.
Need commercial claims for Dr. Day Walz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Day Walz and other internists in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Larissa C. Day Walz treated 283 Medicare patients in 2024, average age 75
CMS counts 283 Medicare patients who saw Dr. Day Walz in 2024. The largest group is 65 to 74, with 142 patients. 74% of them have high cholesterol, and 67% have high blood pressure. 4% are also on Medicaid. Their average risk score is 1.01, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Day Walz's median patient age at 57, with 70% women.
Dr. Day Walz's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Day Walz's Medicare patients by sex, 2024
- Women22078%
- Men6322%
Chronic conditions among Dr. Day Walz's Medicare patients, 2024
- High cholesterol74%
- High blood pressure67%
- Arthritis51%
- Diabetes29%
- Osteoporosis24%
- Mood disorders23%
- Anxiety21%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Day Walz'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
- Women70%
- Men30%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Larissa C. Day Walz wrote 5,461 Medicare Part D claims in 2024
In 2024, Dr. Day Walz wrote 5,461 Medicare Part D claims for 466 patients. 87% of them were for generic drugs. CMS names the drug for 4,860 of them, across 83 drugs with 11 or more claims each, at $478,259 in total drug cost. In 2023, CMS named 4,661 claims across 84 drugs.
Dr. Day Walz's Part D claims by kind of drug, 2024
- Generic4,734 claims87%
- Brand-name704 claims13%
- Other23 claims0%
Dr. Day Walz'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. Day Walz's Part D claims, 2024
- Opioids1%42 of 5,461 claims
- Antibiotics1%56 of 5,461 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: 4,6612024: 4,8604%
Drugs named by CMS: 83 in 2024, 84 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. Larissa C. Day Walz offers telehealth to Medicare patients
Dr. Day Walz accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Day Walz as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Larissa C. Day Walz received $13 in industry payments in 2023
CMS Open Payments shows 1 general payment to Dr. Day Walz from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $13.
Companies that paid Dr. Day Walz the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Larissa C. Day Walz graduated from Indiana University School of Medicine
Dr. Day Walz graduated from Indiana University School of Medicine in 2007.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Larissa C. Day Walz'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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. Larissa C. Day Walz
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. Larissa C. Day Walz's NPI number?
Dr. Larissa C. Day Walz's NPI number is 1316114770. It was assigned on May 14, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Larissa C. Day Walz?
Dr. Larissa C. Day Walz is an internist in Indianapolis, Indiana. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Larissa C. Day Walz practice?
Dr. Day Walz practices at 2001 W 86th St, Indianapolis, IN 46260. Dr. Day Walz's primary practice is Ascension St Vincent Hospital- Indianapolis in Indianapolis, Indiana. Dmand AI also links Dr. Day Walz to 4 hospitals, 2 group practices and clinics, 1 home health agency and 1 medical group.
What is Dr. Larissa C. Day Walz's office phone number?
The practice phone on file for Dr. Day Walz is (317) 338-2172.
What is Dr. Larissa C. Day Walz's medical license number?
Dr. Day Walz holds Indiana license 01068078A.
Which hospitals is Dr. Larissa C. Day Walz affiliated with?
Dr. Day Walz is affiliated with IU Health Methodist Hospital. Dmand AI links Dr. Day Walz to 4 more hospitals.
What medical group is Dr. Larissa C. Day Walz part of?
Dr. Day Walz is linked to IU Health Medical Group. Dmand AI links Dr. Day Walz to 1 more medical group.
Does Dr. Larissa C. Day Walz accept Medicare?
Yes. CMS data shows Dr. Day Walz billed Medicare for 1,102 services in 2024, and Dr. Day Walz accepts Medicare assignment.
Does Dr. Larissa C. Day Walz offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Day Walz as offering telehealth services.
How many Medicare patients does Dr. Larissa C. Day Walz see?
CMS counts 283 Medicare patients who saw Dr. Day Walz in 2024, with an average age of 75.
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What services does Dr. Larissa C. Day Walz bill to Medicare?
In 2024, Dr. Day Walz's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and infusion or chemotherapy administration (96372).
Where did Dr. Larissa C. Day Walz go to medical school?
Dr. Day Walz graduated from Indiana University School of Medicine in 2007.
What drugs does Dr. Larissa C. Day Walz prescribe most?
In 2024 Medicare Part D data, Dr. Day Walz's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Rosuvastatin Calcium.
Has Dr. Larissa C. Day Walz received payments from drug or device companies?
CMS Open Payments shows $13 in general payments to Dr. Day Walz from 1 company from 2023 to 2023. The largest total came from Exact Sciences Corporation.
How long has Dr. Larissa C. Day Walz been practicing?
Dr. Day Walz graduated from medical school in 2007, 19 years ago.
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