DR. NAIHSIEN DAVID CHEN M.D.
NPI 1174699755
Internal Medicine in Modesto, CA
NPI Status: Active since November 27, 2006
Contact Information
803 COFFEE RD STE 6
MODESTO, CA
ZIP 95355
Phone: (626) 888-6000
Fax: (888) 318-6618
- Individual
- Male
- Internal Medicine
- PECOS Enrolled
- Medicare Quality Reporting
About NAIHSIEN CHEN
This page provides the complete NPI Profile along with additional information for Naihsien Chen, an internist established in Modesto, California with a medical specialization in Internal Medicine. The healthcare provider is registered in the NPI registry with number 1174699755 assigned on November 2006. The practitioner's primary taxonomy code is 207R00000X with license number A73562 (CA). The provider is registered as an individual and his NPI record was last updated January 2026.
- NPI
- 1174699755
- Provider Name
- DR. NAIHSIEN DAVID CHEN M.D.
- Other Name
- DR. DAVID CHEN MD
- Other Name Type
- Other Name (5)
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 803 COFFEE RD STE 6 MODESTO, CA 95355
- Location Phone
- (626) 888-6000
- Location Fax
- (888) 318-6618
- Mailing Address
- 5599 ROLLINS ST LAS VEGAS, NV 89118
- Mailing Phone
- (626) 888-6000
- Mailing Fax
- (888) 318-6618
- Is Sole Proprietor?
- No
- Enumeration Date
- 11-27-2006
- Last Update Date
- 01-14-2026
- Code Navigator
An internist like Naihsien Chen is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Internal Medicine
- Taxonomy Code
- 207R00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A73562
- License State
- CA
- Taxonomy Description
- A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 208M00000X | Allopathic & Osteopathic Physicians | Hospitalist | A73562 (CA) |
Medicare Participation & PECOS Enrollment Status
Naihsien Chen is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Provider Referred Orders for Durable Medical Equipment, Devices & Supplies
The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.
Durable Medical Equipment
DME-Other DME (DE000N)
Walker, folding, wheeled, adjustable or fixed height (HCPCS:E0143)
1 DME suppliers used 32 Medicare Claims 32 Services Paid
DME-Other DME (DE000N)
Commode chair, mobile or stationary, with fixed arms (HCPCS:E0163)
1 DME suppliers used 21 Medicare Claims 21 Services Paid
DME-Other DME (DE000N)
Commode chair, mobile or stationary, with detachable arms (HCPCS:E0165)
2 DME suppliers used 139 Medicare Claims 139 Services Paid
DME-Other DME (DE000N)
Powered pressure reducing mattress overlay/pad, alternating, with pump, includes heavy duty (HCPCS:E0181)
1 DME suppliers used 13 Medicare Claims 13 Services Paid
DME-Hospital Beds (DB000N)
Hospital bed, semi-electric (head and foot adjustment), with any type side rails, with mattress (HCPCS:E0260)
1 DME suppliers used 86 Medicare Claims 86 Services Paid
DME-Oxygen and Supplies (DC000N)
Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing (HCPCS:E0431)
1 DME suppliers used 13 Medicare Claims 13 Services Paid
DME-Other DME (DE000N)
Nebulizer, with compressor (HCPCS:E0570)
2 DME suppliers used 14 Medicare Claims 14 Services Paid
DME-Other DME (DE000N)
Patient lift, electric with seat or sling (HCPCS:E0635)
1 DME suppliers used 17 Medicare Claims 17 Services Paid
DME-Wheelchairs (DD021N)
Manual wheelchair accessory, wheel lock brake extension (handle), each (HCPCS:E0961)
1 DME suppliers used 29 Medicare Claims 58 Services Paid
DME-Wheelchairs (DD021N)
Manual wheelchair accessory, anti-tipping device, each (HCPCS:E0971)
1 DME suppliers used 45 Medicare Claims 88 Services Paid
DME-Wheelchairs (DD021N)
Manual wheelchair accessory, anti-tipping device, each (HCPCS:E0971)
2 DME suppliers used 65 Medicare Claims 81 Services Paid
DME-Wheelchairs (DD021N)
Residual limb support system for wheelchair, any type (HCPCS:E1020)
1 DME suppliers used 15 Medicare Claims 15 Services Paid
DME-Wheelchairs (DD021N)
Wheelchair accessory, manual fully reclining back, (recline greater than 80 degrees), each (HCPCS:E1226)
1 DME suppliers used 12 Medicare Claims 12 Services Paid
DME-Oxygen and Supplies (DC002N)
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate (HCPCS:E1390)
2 DME suppliers used 15 Medicare Claims 15 Services Paid
DME-Wheelchairs (DD021N)
General use wheelchair seat cushion, width less than 22 inches, any depth (HCPCS:E2601)
1 DME suppliers used 56 Medicare Claims 56 Services Paid
DME-Wheelchairs (DD021N)
General use wheelchair back cushion, width less than 22 inches, any height, including any type mounting hardware (HCPCS:E2611)
1 DME suppliers used 37 Medicare Claims 37 Services Paid
DME-Wheelchairs (DD000N)
Standard wheelchair (HCPCS:K0001)
2 DME suppliers used 513 Medicare Claims 513 Services Paid
DME-Wheelchairs (DD000N)
Standard hemi (low seat) wheelchair (HCPCS:K0002)
1 DME suppliers used 85 Medicare Claims 85 Services Paid
DME-Wheelchairs (DD000N)
Lightweight wheelchair (HCPCS:K0003)
2 DME suppliers used 69 Medicare Claims 69 Services Paid
DME-Wheelchairs (DD021N)
Elevating leg rests, pair (for use with capped rental wheelchair base) (HCPCS:K0195)
1 DME suppliers used 194 Medicare Claims 194 Services Paid
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Follow-up hospital inpatient care per day, typically 25 minutes
Follow-up hospital inpatient care per day, typically 35 minutes
Hospital discharge day management, more than 30 minutes
Initial hospital inpatient care per day, typically 70 minutes
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
This service was performed 630 times for 167 patientsFollow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
This service was performed 563 times for 176 patientsHospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
This service was performed 118 times for 107 patientsInitial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
This service was performed 148 times for 141 patientsPhysician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 95355 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $133.94
- Minimum New Patient Price $58.87
- Maximum New Patient Price $176.6
- Average New Patient Copayment $33.48
- Minimum New Patient Copayment $14.71
- Maximum New Patient Copayment $44.15
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $103.36
- Minimum Established Patient Price $19.28
- Maximum Established Patient Price $144.6
- Average Established Patient Copayment $25.84
- Minimum Established Patient Copayment $4.82
- Maximum Established Patient Copayment $36.15
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
Quality Reporting
The provider participated in CMS Quality Payment Program. The Quality Payment Program aims to improve population health, reduce costs and improve the care received by Medicare beneficiaries. The following quality measures meet Medicare's statistical reporting standards. Not all providers report the same information, because not all providers give the same services to patients. The quality information is just a snapshot of some the care providers give to their patients. Reporting more or less information is not a reflection of quality.
| Quality Measure | Performance | Number of Patients |
|---|---|---|
| Advance Care Planning | Yes | N/A |
| Implementation of practices/processes to develop advance care planning that includes: documenting the advance care plan or living will within the medical record, educating clinicians about advance care planning motivating them to address advance care planning needs of their patients, and how these needs can translate into quality improvement, educating clinicians on approaches and barriers to talking to patients about end-of-life and palliative care needs and ways to manage its documentation, as well as informing clinicians of the healthcare policy side of advance care planning. | ||
| Care Plan | 93% | 228 |
| Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker or provide an advance care plan | ||
| Implementation of medication management practice improvements | Yes | N/A |
| Manage medications to maximize efficiency, effectiveness and safety that could include one or more of the following: Reconcile and coordinate medications and provide medication management across transitions of care settings and eligible clinicians or groups; Integrate a pharmacist into the care team; and/or Conduct periodic, structured medication reviews. | ||
| Measurement and Improvement at the Practice and Panel Level | Yes | N/A |
| Measure and improve quality at the practice and panel level, such as the American Board of Orthopaedic Surgery (ABOS) Physician Scorecards, that could include one or more of the following: • Regularly review measures of quality, utilization, patient satisfaction and other measures that may be useful at the practice level and at the level of the care team or MIPS eligible clinician or group (panel); and/or • Use relevant data sources to create benchmarks and goals for performance at the practice level and panel level. | ||
| Participation in an AHRQ-listed patient safety organization. | Yes | N/A |
| Participation in an AHRQ-listed patient safety organization. | ||
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1174699755, we treat the final digit (5) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 65 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 7 providers are registered at the same or a nearby location.
MODESTO, CA 95355
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1174699755, enumerated as an "individual" on November 27, 2006.
The provider is located at 803 COFFEE RD STE 6 MODESTO, CA 95355 and the phone number is (626) 888-6000.
Internal Medicine with taxonomy code 207R00000X.
