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DR. NAGUI ACHAMALLAH M.D.
NPI 1629057393
Psychiatry & Neurology - Psychiatry in Modesto, CA

Active since January 11, 2006PECOS EnrolledAccepts Medicare Assignment
1601 CUMMINS DR STE D, MODESTO, CA 95358(510) 900-3125 Get Directions Write a Review

NPPES record last updated: December 13, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 13, 2021, Aug 12, 2021, Dec 6, 2018 and 2 more (5 updates tracked since 2017).

About Dr. Nagui Achamallah M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. NAGUI ACHAMALLAH M.D. (NPI 1629057393) is an individual psychiatry provider in Modesto, California, licensed in California (A48988) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1977).

NPPES Registry Identity

NPI1629057393
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. NAGUI ACHAMALLAHCredential: M.D.
Location Address1601 CUMMINS DR STE DModesto, CA 95358-6411
Mailing Address1601 Cummins Dr Ste DModesto, CA 95358-6411 · (510) 900-3125
Phone(510) 900-3125
Sole ProprietorNo
Medical School CMSOtherGraduated 1977
Enumeration DateJanuary 11, 2006
Last NPPES UpdateDecember 13, 20215 updates tracked since enumeration
NPPES CertifiedAugust 12, 2021
✔ NPI 1629057393 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A48988
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
1601 CUMMINS DR STE D, Modesto, CA 95358
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nagui Achamallah M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7719989334
PECOS Enrollment IDI20070212000444
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Nagui Achamallah reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Cep America - Psychiatry PC
3.5 mi
Psychiatry
1700 COFFEE RD
Modesto, CA 95355
  • Reassigned Medicare billing, California enrollment
  • 208 clinicians in this Medicare group
NPI 1396507547 (209) 526-4500
John Muir Trauma Physicians Billing Service
58 mi
Trauma Surgery
1601 YGNACIO VALLEY RD
Walnut Creek, CA 94598
  • Reassigned Medicare billing, California enrollment
  • 810 clinicians in this Medicare group
NPI 1962551861 (925) 947-5331
Southern California Permanente Medical Group
190 mi
Health Maintenance Organization
9100 ROSEDALE HWY
Bakersfield, CA 93312
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1275756652 (California)
  • 5,228 clinicians in this Medicare group
NPI 1316572753 (877) 608-0044
Alliance For Wellness, Inc.
297 mi
Psychiatry
501 E HARDY ST STE 425
Inglewood, CA 90301
  • Reassigned Medicare billing, California enrollment
  • 86 clinicians in this Medicare group
NPI 1124329131 (747) 998-0387

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial 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.
64 services64 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-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.
35 services29 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95358 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$176.60 typical visit price
range $58.87 – $176.60
Typical copayment $44.15 (range $14.71 – $44.15)
Most-billed visit code 99205
Established Patient
$73.16 typical visit price
range $19.28 – $144.60
Typical copayment $18.29 (range $4.82 – $36.15)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 10

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MOHSEN VAZIRIAN M.D.
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125
JESSY JOSEPH
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125
DR. ALEX CHANDLER M.D.
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125
AMI SHAH D.O.
Anesthesiology
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (800) 498-7157
AMANDA N MCCORMICK PA-C
Physician Assistant
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 350-2808
VISANT A. SANATHARA M.D.
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125
PHILIPP ANDREAS SACK M.D.
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125
DR. ANTHONY A. MAZZARULLI MD
Psychiatry & Neurology (Psychiatry)
1601 CUMMINS DR STE D
MODESTO, CA 95358
Stanislaus County (510) 900-3125

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Nagui Achamallah's NPI number?

The NPI number for Nagui Achamallah is 1629057393. It was assigned to this individual provider in the NPPES registry on January 11, 2006.

Where is Nagui Achamallah located?

Nagui Achamallah practices at 1601 Cummins Dr Ste D, Modesto, CA 95358. The listed phone number is (510) 900-3125.

What is Nagui Achamallah's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Nagui Achamallah enrolled in Medicare?

Yes. Nagui Achamallah is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Nagui Achamallah's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nagui Achamallah reassigns Medicare benefits to 4 organizations: Cep America - Psychiatry PC (Modesto, CA), John Muir Trauma Physicians Billing Service (Walnut Creek, CA), Southern California Permanente Medical Group (Bakersfield, CA) and Alliance For Wellness, Inc. (Inglewood, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nagui Achamallah's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Nagui Achamallah was last updated on December 13, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.