NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1235183807 MD
Verify on CMS → Chandar Singaram, MD
Gastroenterology Physician in Sioux Falls, South Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,567 in Gastroenterology 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
945
Medicare Part D claims · 128 beneficiaries · Gastroenterology Physician avg: 833
Industry payments
$5.3K
82 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Chandar Singaram, MD filed 945 Medicare Part D claims in 2023 as a Gastroenterology Physician in Sioux Falls, South Dakota.
- 945
- Part D claims, 2023
- $5.3K
- industry payments (Sunshine Act)
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.
Chandar Singaram, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
945 Top 25% higher than 75% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Chandar Singaram, MD 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 Chandar Singaram, MD?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
945 13% vs specialty avg
Specialty distribution in South Dakota
How Gastroenterology Physician compares to other specialties among South Dakota 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 Gastroenterology 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).
Chandar Singaram, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 1905 W 57TH ST STE 1, Sioux Falls, SD, 57108, with a listed phone of (605) 310-2000. NPI 1235183807 was issued on 05/19/2006.
Medicare Part D records for calendar year 2023 show 945 prescription claims written by this provider, covering 128 Medicare beneficiaries and totaling roughly $2.0 million in drug spend, with an opioid prescribing rate of 1.6%.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1235183807 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/19/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Chandar Singaram, MD. Source: openpaymentsdata.cms.gov.
Total received
$5.3K
Largest payer
GENZYME CORPORATION
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
945
Total Claims
$2.0M
Total Drug Cost
128
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,238
- Total Day Supply
- 34,747
- Generic Drug Cost
- $33K
- Opioid Claims
- 15 (1.6% rate)
- Antibiotic Claims
- 52
Patient Demographics
- Average Patient Age
- 70.1 years
- Avg HCC Risk Score
- 1.33
- Gender Split
- 70% female / 30% male
- Age Distribution
- <65: 26, 65-74: 58, 75-84: 32, 85+: 12
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Chandar Singaram, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
83 claims
- Sucraid
Sucraid
74 claims
- Diphenoxylate-Atro…
Diphenoxylate-Atropine
73 claims
- Omeprazole
Omeprazole
58 claims
- Linzess 33
Linzess
33 claims
- Trulance 31
Trulance
31 claims
- Azathioprine 30
Azathioprine
30 claims
- Nortriptyline Hcl 29
Nortriptyline Hcl
29 claims
| Drug | Claims |
|---|---|
| Prednisone | 83 |
| Sucraid Sacrosidase | 74 |
| Diphenoxylate-Atropine Diphenoxylate Hcl/Atropine | 73 |
| Omeprazole | 58 |
| Linzess Linaclotide | 33 |
| Trulance Plecanatide | 31 |
| Azathioprine | 30 |
| Nortriptyline Hcl | 29 |
| Viberzi Eluxadoline | 28 |
| Xifaxan Rifaximin | 25 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Chandar Singaram, MD fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Chandar Singaram, MD's 945 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Singaram.
Kesiena Akpoigbe
Yankton, SD
Dr. Oksana Aleksenko
MD
Rapid City, SD
Aydamir Alrakawi
Rapid City, SD
Dale Bachwich
Rapid City, SD
Dr. John Barker
M.D.
Sioux Falls, SD
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the South Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gastroenterology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Explore South Dakota
Frequently Asked Questions
What is Chandar Singaram, MD's specialty? ▼
Chandar Singaram, MD specializes in Gastroenterology Physician and practices in Sioux Falls, South Dakota. Credentials: MD.
How much does Chandar Singaram, MD prescribe under Medicare Part D? ▼
In 2023, Chandar Singaram, MD wrote 945 Medicare Part D claims totaling $2.0M in drug costs for 128 beneficiaries.
Where is Chandar Singaram, MD located? ▼
Chandar Singaram, MD is located at 1905 W 57TH ST STE 1, Sioux Falls, SD, 57108. Phone: (605) 310-2000.
What is Chandar Singaram, MD's NPI number? ▼
Chandar Singaram, MD's National Provider Identifier (NPI) is 1235183807, issued on 05/19/2006.
Does Chandar Singaram, MD prescribe opioids? ▼
Yes, Chandar Singaram, MD had 15 opioid claims in 2023 with an opioid prescribing rate of 1.6%.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Chandar Singaram, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Chandar Singaram, MD's most frequently prescribed drugs include Prednisone, Sucraid, Diphenoxylate-Atropine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Chandar Singaram, MD accept Medicare? ▼
Chandar Singaram, MD appears in CMS Medicare data with 945 Part D claims and 128 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Chandar Singaram, MD's credentials? ▼
Chandar Singaram, MD's NPI is 1235183807 with credentials MD. 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
Compiled from official public sources by the PlainDoctor editorial team.