NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1922593938 MD
Verify on CMS → Annapoorna Singh, MD
Hospitalist Physician in Ames, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,825 in Hospitalist 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
317
Medicare Part D claims · 151 beneficiaries · Hospitalist Physician avg: 888
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Annapoorna Singh, MD filed 317 Medicare Part D claims in 2023 as a Hospitalist Physician in Ames, Iowa, prescribing 93% generic.
- 317
- Part D claims, 2023
- 93%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Annapoorna Singh, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
317 Top 43% higher than 57% 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 certification likely (heuristic, not verified)
Annapoorna Singh, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Annapoorna Singh, MD?
Quality data not reportedPrimary specialty
Hospitalist Physician
Medicare Part D claims
317 64% vs specialty avg
Specialty distribution in Iowa
How Hospitalist Physician compares to other specialties among Iowa 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 Hospitalist 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).
Annapoorna Singh, MD appears in the CMS NPPES registry as a Hospitalist Physician provider holding MD credentials at 1111 DUFF AVE, Ames, IA, 50010, with a listed phone of (515) 239-6992. NPI 1922593938 was issued on 06/22/2018.
Medicare Part D records for calendar year 2023 show 317 prescription claims written by this provider, covering 151 Medicare beneficiaries and totaling roughly $9K in drug spend, split 7% brand-name and 93% generic by claim count, with an opioid prescribing rate of 8.2%.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,825 enrolled providers across 54 states and an average of 888 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 | 1922593938 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 06/22/2018 |
Hospital and facility affiliations
Facilities where Annapoorna Singh, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Mcfarland Clinic PC
Ames, IA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Annapoorna Singh, MD - brand share 7.0%
Hospitalist Physician average
7% brand-name claims vs 93% generic, on 317 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
317
Total Claims
$9K
Total Drug Cost
151
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 329
- Total Day Supply
- 5,642
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $5K
- Generic Drug Cost
- $4K
- Opioid Claims
- 26 (8.2% rate)
- Antibiotic Claims
- 90
Patient Demographics
- Average Patient Age
- 73.6 years
- Avg HCC Risk Score
- 2.65
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 28, 65-74: 54, 75-84: 43, 85+: 26
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Annapoorna Singh, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
24 claims
- Prednisone
Prednisone
20 claims
- Doxycycline Hyclate
Doxycycline Hyclate
19 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
18 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
18 claims
- Levofloxacin
Levofloxacin
18 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
13 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 24 |
| Prednisone | 20 |
| Doxycycline Hyclate | 19 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 18 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 18 |
| Levofloxacin | 18 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How Annapoorna Singh, MD fits within the Hospitalist Physician landscape nationally.
16,825
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
Annapoorna Singh, MD's 317 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Singh.
Ahmed Abdulrahman
Sioux City, IA
Dr. Abdul Abdussalam
MD
Council Bluffs, IA
Dr. Bashar Abuqayas
MD
Iowa City, IA
Dr. Luis Acosta Nunez
MD
Des Moines, IA
Ibrahim Alakhras
Ames, IA
Compare Hospitalist 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 Iowa medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist 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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Frequently Asked Questions
What is Annapoorna Singh, MD's specialty? ▼
Annapoorna Singh, MD specializes in Hospitalist Physician and practices in Ames, Iowa. Credentials: MD.
How much does Annapoorna Singh, MD prescribe under Medicare Part D? ▼
In 2023, Annapoorna Singh, MD wrote 317 Medicare Part D claims totaling $9K in drug costs for 151 beneficiaries.
Where is Annapoorna Singh, MD located? ▼
Annapoorna Singh, MD is located at 1111 DUFF AVE, Ames, IA, 50010. Phone: (515) 239-6992.
What is Annapoorna Singh, MD's NPI number? ▼
Annapoorna Singh, MD's National Provider Identifier (NPI) is 1922593938, issued on 06/22/2018.
Does Annapoorna Singh, MD prescribe more brand-name or generic drugs? ▼
Annapoorna Singh, MD's prescribing is 7% brand-name and 93% generic drugs by claim count, with $5K in brand drug costs.
Does Annapoorna Singh, MD prescribe opioids? ▼
Yes, Annapoorna Singh, MD had 26 opioid claims in 2023 with an opioid prescribing rate of 8.2%.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,825 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does Annapoorna Singh, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Annapoorna Singh, MD's most frequently prescribed drugs include Pantoprazole Sodium, Prednisone, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Annapoorna Singh, MD accept Medicare? ▼
Annapoorna Singh, MD appears in CMS Medicare data with 317 Part D claims and 151 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Annapoorna Singh, MD's credentials? ▼
Annapoorna Singh, MD's NPI is 1922593938 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.