Based on the provided text, here are the key points about timely filing limits:

1. The time frame for submitting initial claims varies depending on the insurance company.

2. Failure to submit claims within this time frame may result in denial due to untimely filing.

3. Timely filing starts from the date of service (DOS).

4. Insurance companies set these deadlines as a requirement for covering services rendered by their subscribers.

5. Some specific examples and limits include:

- Aetna: 100 Days for Participating Providers or 12 months for Non-Participating Providers

- Medicare: N/A mentioned in the text

- BCBS (Blue Cross Blue Shield): varies depending on plan type, but typically ranges from 80 to 120 days after receiving an Explanation of Benefits (EOB)

- Cigna: Varies by plan and provider type

6. It's essential for healthcare providers to check with their specific insurance carriers or consult with a claims representative if they're unsure about the timely filing requirements, as these can change.

7. Providers should always follow the earliest deadline set by both primary and secondary payers when multiple policies are involved.

8. Understanding and adhering strictly to timely filing guidelines is crucial for receiving prompt reimbursement for services rendered to patients covered under various insurance plans.

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