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SIERRA DAWN GROSS M.D.
NPI 1649698366
Internal Medicine in Sheridan, WY

Active since March 31, 2014PECOS EnrolledAccepts Medicare Assignment
80.86/100
CMS Quality Rating
1333 W 5TH ST, STE 112, SHERIDAN, WY 82801(307) 675-2650(307) 675-2651 Get Directions Write a Review

NPPES record last updated: October 17, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 11, 2021, Nov 6, 2019, Oct 29, 2019 and 2 more (5 updates tracked since 2017).

About Sierra Dawn Gross M.d. NPPES

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

SIERRA DAWN GROSS M.D. (NPI 1649698366) is an individual internal medicine provider in Sheridan, Wyoming, licensed in Wyoming (10930A) and active in the NPI registry since March 2014. She is enrolled in Medicare PECOS, is affiliated with Campbell County Health, and maintains a secondary practice location in Sheridan.

NPPES Registry Identity

NPI1649698366
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameSIERRA DAWN GROSSCredential: M.D.
Location Address1333 W 5TH ST, STE 112Sheridan, WY 82801-2752
Mailing Address1333 W 5th St, Ste 110Sheridan, WY 82801-2752 · (307) 675-2650 · Fax (307) 675-2651
Phone(307) 675-2650
Fax(307) 675-2651
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateMarch 31, 2014
Last NPPES UpdateOctober 17, 20255 updates tracked since enumeration
NPPES CertifiedOctober 17, 2025
✔ NPI 1649698366 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in WY · 10930A
Definition
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.
1333 W 5TH ST, STE 112, Sheridan, WY 82801
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Other Names 1

Former Name (1)Sierra Dawn Gross Stallman M.d.

Secondary Practice Location 1

Location 11401 W 5th StSheridan, WY 82801-2705 · Phone (307) 675-2650 · Fax (307) 675-2651

Other Identifiers 1

Medicaid147313100WY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Wyoming.Insurance ›

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

Sierra Dawn Gross 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 ID1557588779
PECOS Enrollment IDI20171016002766
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

2

Medicare enrollment records show Sierra Gross reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Big Horn Health Network
Same address
Internal Medicine
1333 W 5TH ST
Sheridan, WY 82801
  • Reassigned Medicare billing, Wyoming enrollment
  • 121 clinicians in this Medicare group
NPI 1861722688 (307) 675-2650
Memorial Hospital Of Sheridan County
0.1 mi
General Acute Care Hospital
1401 W 5TH ST
Sheridan, WY 82801
  • Reassigned Medicare billing, Wyoming enrollment
  • 133 clinicians in this Medicare group
NPI 1487707188 (307) 672-1000

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 6

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
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.
198 services99 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
108 services101 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
94 services55 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
84 services80 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital 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.
46 services44 patients
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.
24 services23 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Campbell County Health

Acute Care Hospitals · Gillette, WY
2/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number530002
Location501 South Burma AvenueGillette, WY 82716 · Campbell County
Emergency services

Sheridan Memorial Hospital

Acute Care Hospitals · Sheridan, WY
4/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number530006
Location1401 W 5th StSheridan, WY 82801 · Sheridan County
Emergency services

Johnson County Healthcare Center

Critical Access Hospitals · Buffalo, WY
OwnershipGovernment - Hospital District or Authority
CMS Certification Number531308
Location497 West LottBuffalo, WY 82834 · Johnson County

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 82801 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
$129.37 typical visit price
range $56.42 – $170.72
Typical copayment $32.34 (range $14.10 – $42.68)
Most-billed visit code 99204
Established Patient
$99.46 typical visit price
range $18.19 – $139.32
Typical copayment $24.86 (range $4.54 – $34.83)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.86/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality69.83
Promoting Interoperability98
Improvement Activities40
Cost68.06

Referred Medical Equipment & Supplies CMS DME claims 18

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
5 suppliers23 claims54 services$6.30 avg. paid by Medicare
Tubing with integrated heating element for use with positive airway pressure device A4604
DME-Other DME · category DE001N
1 supplier25 claims25 services$36.12 avg. paid by Medicare
Full face mask used with positive airway pressure device, each A7030
DME-Other DME · category DE001N
3 suppliers20 claims20 services$111.01 avg. paid by Medicare
Face mask interface, replacement for full face mask, each A7031
DME-Other DME · category DE001N
3 suppliers19 claims50 services$42.83 avg. paid by Medicare
Cushion for use on nasal mask interface, replacement only, each A7032
DME-Other DME · category DE001N
2 suppliers20 claims114 services$23.94 avg. paid by Medicare
Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap A7034
DME-Other DME · category DE001N
2 suppliers25 claims25 services$65.78 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 4

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

DR. HANNAH MARIE HALL M.D.
Internal Medicine
1333 W 5TH ST, STE 112
SHERIDAN, WY 82801
Sheridan County (307) 675-2650
KIMBERLEE D WILLIAMS FNP
Nurse Practitioner (Family)
1333 W 5TH ST, STE 112
SHERIDAN, WY 82801
Sheridan County (307) 675-2650
JULI ANNE ACKERMAN MD
Internal Medicine
1333 W 5TH ST, STE 112
SHERIDAN, WY 82801
Sheridan County (307) 675-2650
DAVID C WALKER DO
Internal Medicine
1333 W 5TH ST, STE 112
SHERIDAN, WY 82801
Sheridan County (307) 675-2650

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 Sierra Gross's NPI number?

The NPI number for Sierra Gross is 1649698366. It was assigned to this individual provider in the NPPES registry on March 31, 2014. The provider is also known as Sierra Dawn Gross Stallman M.D..

Where is Sierra Gross located?

Sierra Gross practices at 1333 W 5th St, Ste 112, Sheridan, WY 82801. The listed phone number is (307) 675-2650.

What is Sierra Gross's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Sierra Gross enrolled in Medicare?

Yes. Sierra Gross 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 Sierra Gross's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sierra Gross reassigns Medicare benefits to 2 organizations: Big Horn Health Network (Sheridan, WY) and Memorial Hospital Of Sheridan County (Sheridan, WY). 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 Sierra Gross's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Sierra Gross accept?

Health plans from Blue Cross Blue Shield of Wyoming list Sierra Gross as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Sierra Gross affiliated with any hospitals?

According to CMS data, Sierra Gross is affiliated with Campbell County Health, Sheridan Memorial Hospital and Johnson County Healthcare Center.

When was this NPI record last updated?

The NPPES record for Sierra Gross was last updated on October 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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.