G0306 — Complete cbc, automated (hgb, hct, rbc, wbc, without platelet count) and automated wbc differential count
G0306 is a HCPCS Level II code for complete cbc, automated (hgb, hct, rbc, wbc, without platelet count) and automated wbc differential count. It belongs to the Procedures and Professional Services (Temporary) section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Physician fee schedule statusX
Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.
Global period: XXX
Want the dollar amount for your locality? The fee calculator applies your GPCI and the current conversion factor.
Medically Unlikely Edits — units per day
The most units of G0306 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 1 unit MAI 3 — Date of Service Edit: Clinical · Clinical: Data
- outpatient
- 4 units MAI 3 — Date of Service Edit: Clinical · Clinical: Data
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for G0306
- Long descriptor
- Complete cbc, automated (hgb, hct, rbc, wbc, without platelet count) and automated wbc differential count
- Short descriptor
- Cbc/diffwbc w/o platelet
- Added
- January 1, 2004
- BETOS
- T1D
- Pricing indicator
- 21 — Clinical lab fee schedule
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Price subject to the national limitation amount.
Codes adjacent to G0306
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If G0306 is not quite right, the correct code is very often within a few positions of it.
- G0296Counseling visit to discuss need for lung cancer screening using low dose ct scan (ldct) (service is for eligibility determination and shared decision making)
- G0297Low dose ct scan (ldct) for lung cancer screeningterminated
- G0299Direct skilled nursing services of a registered nurse (rn) in the home health or hospice setting, each 15 minutes
- G0300Direct skilled nursing services of a licensed practical nurse (lpn) in the home health or hospice setting, each 15 minutes
- G0302Pre-operative pulmonary surgery services for preparation for lvrs, complete course of services, to include a minimum of 16 days of services
- G0303Pre-operative pulmonary surgery services for preparation for lvrs, 10 to 15 days of services
- G0304Pre-operative pulmonary surgery services for preparation for lvrs, 1 to 9 days of services
- G0305Post-discharge pulmonary surgery services after lvrs, minimum of 6 days of services
- G0307Complete (cbc), automated (hgb, hct, rbc, wbc; without platelet count)
- G0308Creation of subcutaneous pocket with insertion of 180 day implantable interstitial glucose sensor, including system activation and patient trainingterminated
- G0309Removal of implantable interstitial glucose sensor with creation of subcutaneous pocket at different anatomic site and insertion of new 180 day implantable sensor, including system activationterminated
- G0310Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service, 5 to 15 mins time (this code is used for medicaid billing purposes)
- G0311Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service, 16-30 mins time (this code is used for medicaid billing purposes)
- G0312Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service for ages under 21, 5 to 15 mins time (this code is used for medicaid billing purposes)
- G0313Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service for ages under 21, 16-30 mins time (this code is used for medicaid billing purposes)
- G0314Immunization counseling by a physician or other qualified health care professional for covid-19, ages under 21, 16-30 mins time (this code is used for the medicaid early and periodic screening, diagnostic, and treatment benefit (epsdt)
Questions about G0306
What is HCPCS code G0306?
G0306 is a HCPCS Level II code for complete cbc, automated (hgb, hct, rbc, wbc, without platelet count) and automated wbc differential count. It sits in the Procedures and Professional Services (Temporary) section.
Does Medicare cover G0306?
The CMS HCPCS file marks G0306 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
How is G0306 paid under the physician fee schedule?
G0306 carries PFS status code X. Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.