NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1578781845 D.O.
Verify on CMS → Evan Geissler, D.O.
Family Medicine Physician in Hammond, Indiana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 in Family Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
336
Medicare Part D claims · 82 beneficiaries · Family Medicine Physician avg: 3K
What the federal data shows
Evan Geissler, D.O. filed 336 Medicare Part D claims in 2023 as a Family Medicine Physician in Hammond, Indiana.
- 336
- Part D claims, 2023
- ≥57th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Evan Geissler, D.O.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1578781845), first enumerated 04/23/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 336 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1578781845 · Family Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1578781845
- ENUM-MID 2007
- TAX-MEGA 148K Family Medicine
- RX-LIGHT 336
- BOOK-LIGHT 3,321 in Indiana
- PHOTO-ENUM Namrata Joshi · 2007
Evan Geissler, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
336 ≥ 57th percentile 57% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Evan Geissler, D.O. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Evan Geissler, D.O.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
336 90% vs specialty avg
Specialty distribution in Indiana
How Family Medicine Physician compares to other specialties among Indiana providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Family Medicine Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1578781845 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 04/23/2007 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
336
Total Claims
$34K
Total Drug Cost
82
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 927
- Total Day Supply
- 27,645
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 77.7 years
- Avg HCC Risk Score
- 1.21
- Gender Split
- 49% female / 51% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Evan Geissler, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Rosuvastatin Calcium
Rosuvastatin Calcium
22 claims
- Amlodipine Besylate
Amlodipine Besylate
21 claims
- Pravastatin Sodium
Pravastatin Sodium
19 claims
- Atorvastatin Calcium
Atorvastatin Calcium
18 claims
- Allopurinol
Allopurinol
15 claims
- Metformin Hcl
Metformin Hcl
15 claims
| Drug | Claims |
|---|---|
| Rosuvastatin Calcium | 22 |
| Amlodipine Besylate | 21 |
| Pravastatin Sodium | 19 |
| Atorvastatin Calcium | 18 |
| Allopurinol | 15 |
| Metformin Hcl | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Evan Geissler, D.O. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Evan Geissler, D.O.'s 336 claims are below the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Geissler, both outside Indiana so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Geissler.
One of 3,321 Family Medicine Physician providers enrolled in Indiana, 5 are shown here.
Dr. Faryaal Aamir
MD
Boonville, IN
Dr. Troy Abbott
MD
Muncie, IN
Dr. Musa Abdalla
M. D.
Lagrange, IN
Dr. Azra Abdullah
M.D.
Indianapolis, IN
Dr. Daniel Abel
M.D.
Mishawaka, IN
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Evan Geissler, D.O.'s specialty? ▼
Evan Geissler, D.O. specializes in Family Medicine Physician and practices in Hammond, Indiana. Credentials: D.O..
How much does Evan Geissler, D.O. prescribe under Medicare Part D? ▼
In 2023, Evan Geissler, D.O. wrote 336 Medicare Part D claims totaling $34K in drug costs for 82 beneficiaries.
Where is Evan Geissler, D.O. located? ▼
Evan Geissler, D.O. is located at 7134 CALUMET AVE, Hammond, IN, 46324. Phone: (219) 931-4725.
What is Evan Geissler, D.O.'s NPI number? ▼
Evan Geissler, D.O.'s National Provider Identifier (NPI) is 1578781845, issued on 04/23/2007.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Evan Geissler, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Evan Geissler, D.O.'s most frequently prescribed drugs include Rosuvastatin Calcium, Amlodipine Besylate, Pravastatin Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Evan Geissler, D.O. accept Medicare? ▼
Evan Geissler, D.O. appears in CMS Medicare data with 336 Part D claims and 82 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Evan Geissler, D.O.'s credentials? ▼
Evan Geissler, D.O.'s NPI is 1578781845 with credentials D.O.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.