Mani Nallasivan, M.D.
NPI 1639171606 · Cardiovascular Disease Physician · Merced, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mani Nallasivan, M.D. is a Cardiovascular Disease Physician provider in Merced, CA (NPI 1639171606).
Provider details
- NPI number
- 1639171606
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A44096 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,127 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 2,252 | $91 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 455 | $113 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 359 | $205 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure, Each Additional 15 Minutes99153 | 211 | $12 |
| Technetium Tc-99m Sestamibi, Diagnostic, Per Study DoseA9500 | 178 | $84 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amiodarone Hcl | 310 | 101 |
| Metoprolol Succinate | 266 | 93 |
| Furosemide | 179 | 72 |
| Cilostazol | 164 | 63 |
| Atorvastatin Calcium | 155 | 50 |
| Rivaroxabanbrand: Xarelto | 153 | 51 |
| Apixabanbrand: Eliquis | 138 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$655 across 30 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-10
- Last updated
- 2019-03-14
Frequently asked questions
- What is Mani Nallasivan's NPI number?
- Mani Nallasivan's National Provider Identifier (NPI) is 1639171606, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mani Nallasivan's specialty?
- Mani Nallasivan is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mani Nallasivan located?
- Mani Nallasivan's practice location on file with NPPES is 424 E Yosemite Ave Ste a, Merced, CA 95340-8499.
- What is Mani Nallasivan's phone number?
- The practice phone number listed in the NPPES registry for Mani Nallasivan is (209) 723-6882.
- Does Mani Nallasivan accept Medicare?
- Mani Nallasivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mani Nallasivan's NPI active?
- Yes — Mani Nallasivan's NPI (1639171606) is active in the NPPES registry as of the last update on 2019-03-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.